diff --git a/examples/period.rs b/examples/period.rs
new file mode 100644
index 0000000..c2ebcb6
--- /dev/null
+++ b/examples/period.rs
@@ -0,0 +1,159 @@
+use std::error::Error;
+
+use flights::{
+    emissions, load_aircraft_owners, load_aircrafts, load_owners, Aircraft, Class, Company, Fact,
+};
+
+#[derive(serde::Serialize)]
+pub struct Context {
+    pub owner: Fact<Company>,
+    pub aircraft: Aircraft,
+    pub from_date: String,
+    pub to_date: String,
+    pub number_of_legs: Fact<usize>,
+    pub emissions_tons: Fact<usize>,
+    pub dane_years: Fact<String>,
+    pub number_of_legs_less_300km: usize,
+    pub number_of_legs_more_300km: usize,
+    pub ratio_commercial_300km: String,
+}
+
+fn render(context: &Context) -> Result<(), Box<dyn Error>> {
+    let path = "story.md";
+
+    let template = std::fs::read_to_string("examples/template.md")?;
+
+    let mut tt = tinytemplate::TinyTemplate::new();
+    tt.set_default_formatter(&tinytemplate::format_unescaped);
+    tt.add_template("t", &template)?;
+
+    let rendered = tt.render("t", context)?;
+
+    println!("Story written to {path}");
+    std::fs::write(path, rendered)?;
+    Ok(())
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let owners = load_owners()?;
+    let aircraft_owners = load_aircraft_owners()?;
+    let aircrafts = load_aircrafts()?;
+
+    let to = time::OffsetDateTime::now_utc().date() - time::Duration::days(1);
+    let from = to - time::Duration::days(90);
+
+    let tail_number = "OY-GFS";
+    let aircraft = aircrafts
+        .get(tail_number)
+        .ok_or_else(|| Into::<Box<dyn Error>>::into("Aircraft ICAO number not found"))?
+        .clone();
+    let aircraft_owner = aircraft_owners
+        .get(tail_number)
+        .ok_or_else(|| Into::<Box<dyn Error>>::into("Owner of tail number not found"))?;
+    println!("Aircraft owner: {}", aircraft_owner.owner);
+    let company = owners
+        .get(&aircraft_owner.owner)
+        .ok_or_else(|| Into::<Box<dyn Error>>::into("Owner not found"))?;
+    println!("Owner information found");
+    let owner = Fact {
+        claim: company.clone(),
+        source: aircraft_owner.source.clone(),
+        date: aircraft_owner.date.clone(),
+    };
+
+    let icao = &aircraft.icao_number;
+    println!("ICAO number: {}", icao);
+
+    let iter = flights::DateIter {
+        from,
+        to,
+        increment: time::Duration::days(1),
+    };
+
+    let mut positions = vec![];
+    for date in iter {
+        positions.extend(flights::positions(icao, &date, 1000.0)?);
+    }
+
+    let legs = flights::legs(positions.into_iter());
+    let legs = legs
+        .into_iter()
+        // ignore legs that are too fast, as they are likely noise
+        .filter(|leg| leg.duration() > time::Duration::minutes(5))
+        // ignore legs that are too short, as they are likely noise
+        .filter(|leg| leg.distance() > 3.0)
+        // ignore legs that are too low, as they are likely noise
+        .filter(|leg| leg.maximum_altitude > 1000.0)
+        .collect::<Vec<_>>();
+    println!("number_of_legs: {}", legs.len());
+    for leg in &legs {
+        println!(
+            "{},{},{},{},{},{},{},{},{}",
+            leg.from.datetime(),
+            leg.from.latitude(),
+            leg.from.longitude(),
+            leg.from.altitude(),
+            leg.to.datetime(),
+            leg.to.latitude(),
+            leg.to.longitude(),
+            leg.to.altitude(),
+            leg.maximum_altitude
+        );
+    }
+
+    let commercial_to_private_ratio = 10.0;
+    let commercial_emissions_tons = legs
+        .iter()
+        .map(|leg| emissions(leg.from.pos(), leg.to.pos(), Class::First) / 1000.0)
+        .sum::<f64>();
+    let emissions_tons = Fact {
+        claim: (commercial_emissions_tons * commercial_to_private_ratio) as usize,
+        source: format!("Commercial flights would have emitted {commercial_emissions_tons:.1} tons of CO2e (based on [myclimate.org](https://www.myclimate.org/en/information/about-myclimate/downloads/flight-emission-calculator/) - retrieved on 2023-10-19). Private jets emit 5-14x times. 10x was used based on [transportenvironment.org](https://www.transportenvironment.org/discover/private-jets-can-the-super-rich-supercharge-zero-emission-aviation/)"),
+        date: "2023-10-05, from 2021-05-27".to_string(),
+    };
+
+    let short_legs = legs.iter().filter(|leg| leg.distance() < 300.0);
+    let long_legs = legs.iter().filter(|leg| leg.distance() >= 300.0);
+
+    let dane_emissions_tons = Fact {
+            claim: 5.1,
+            source: "A dane emitted 5.1 t CO2/person/year in 2019 according to [work bank data](https://ourworldindata.org/co2/country/denmark).".to_string(),
+            date: "2023-10-08".to_string(),
+        };
+
+    let dane_years = format!(
+        "{:.0}",
+        emissions_tons.claim as f32 / dane_emissions_tons.claim as f32
+    );
+    let dane_years = Fact {
+        claim: dane_years,
+        source: "https://ourworldindata.org/co2/country/denmark Denmark emits 5.1 t CO2/person/year in 2019.".to_string(),
+        date: "2023-10-08".to_string(),
+    };
+
+    let from_date = from.to_string();
+    let to_date = to.to_string();
+
+    let number_of_legs = Fact {
+        claim: legs.len(),
+        source: format!("[adsbexchange.com](https://globe.adsbexchange.com/?icao={icao}) between {from_date} and {to_date}"),
+        date: to.to_string()
+    };
+
+    let context = Context {
+        owner,
+        aircraft,
+        from_date,
+        to_date,
+        number_of_legs,
+        emissions_tons,
+        dane_years,
+        number_of_legs_less_300km: short_legs.count(),
+        number_of_legs_more_300km: long_legs.count(),
+        ratio_commercial_300km: format!("{:.0}", commercial_to_private_ratio),
+    };
+
+    render(&context)?;
+
+    Ok(())
+}
diff --git a/examples/template.md b/examples/template.md
new file mode 100644
index 0000000..44aa345
--- /dev/null
+++ b/examples/template.md
@@ -0,0 +1,29 @@
+# {owner.claim.name} use of private jets
+
+{owner.claim.name} {owner.claim.statement.claim}[^1].
+
+Yet, between {from_date} and {to_date}, their staff travelled **{number_of_legs.claim} times**[^2] on {owner.claim.name}'s own private jet, {aircraft.tail_number}[^3].
+
+> These {number_of_legs.claim} trips emitted {emissions_tons.claim} tons of CO2. A Dane
+  takes **{dane_years.claim} years** to emit this amount of CO2[^4].
+
+Of these,
+* {number_of_legs_less_300km} trips were less than 300 km and could have been replaced by
+  a limusine or first class train ticket, which would have emitted ~30-50x less CO2.
+* {number_of_legs_more_300km} trips could have been replaced by
+  a first class ticket on a commercial aircraft, which would have emitted
+  ~{ratio_commercial_300km}x less CO2[^5].
+
+Billionaires and companies alike are incapable of regulating their emissions,
+recklessly destroying the common good.
+Ban private jets now and until they emit what equivalent means of transportation would emit.
+
+## References
+
+[^1]: {owner.claim.statement.source} - retrieved on {owner.claim.statement.date}
+[^2]: {number_of_legs.source} - retrieved on {number_of_legs.date}
+[^3]: {owner.source} - retrieved on {owner.date}
+[^4]: {dane_years.source} - retrieved on {dane_years.date}
+[^5]: {emissions_tons.source} - retrieved on {emissions_tons.date}
+
+Copyright Jorge Leitão, released under [CC0](https://creativecommons.org/public-domain/cc0/) - No Rights Reserved.
diff --git a/src/aircraft_db.rs b/src/aircraft_db.rs
index 5baa892..1830e0d 100644
--- a/src/aircraft_db.rs
+++ b/src/aircraft_db.rs
@@ -3,14 +3,14 @@ use std::collections::HashMap;
 use std::error::Error;
 
 use reqwest;
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 use serde_json;
 
 /// [`HashMap`] between tail number (e.g. "OY-TWM") and an [`Aircraft`]
 pub type Aircrafts = HashMap<String, Aircraft>;
 
 /// An in-memory representation of an aircraft data
-#[derive(Deserialize, Debug, Clone)]
+#[derive(Deserialize, Serialize, Debug, Clone)]
 pub struct Aircraft {
     /// The ICAO number of the aircraft (e.g. `459CD3`)
     pub icao_number: String,
diff --git a/src/emissions.rs b/src/emissions.rs
index 21847b4..560f592 100644
--- a/src/emissions.rs
+++ b/src/emissions.rs
@@ -101,7 +101,7 @@ fn distance_to_emissions(distance: f64, class: Class) -> f64 {
     }
 }
 
-/// Returns emissions of a commercial flight flying `from` -> `to`, in kg of eCO2.
+/// Returns emissions of a commercial flight flying `from` -> `to`, in kg of CO2e.
 /// The exact calculation is described here: https://www.myclimate.org/en/information/about-myclimate/downloads/flight-emission-calculator/
 pub fn emissions(from: (f64, f64), to: (f64, f64), class: Class) -> f64 {
     distance_to_emissions(super::distance(from, to), class)
diff --git a/src/icao_to_trace.rs b/src/icao_to_trace.rs
index 40ad888..aeda839 100644
--- a/src/icao_to_trace.rs
+++ b/src/icao_to_trace.rs
@@ -5,6 +5,8 @@ use reqwest::header;
 use reqwest::{self, StatusCode};
 use time::PrimitiveDateTime;
 
+use super::Position;
+
 fn last_2(icao: &str) -> &str {
     let bytes = icao.as_bytes();
     std::str::from_utf8(&bytes[bytes.len() - 2..]).unwrap()
@@ -127,56 +129,6 @@ pub fn trace_cached(
     Ok(std::mem::take(trace))
 }
 
-/// A position of an aircraft
-#[derive(Debug, Clone, Copy)]
-pub enum Position {
-    /// Aircraft transponder declares the aircraft is grounded
-    Grounded {
-        datetime: PrimitiveDateTime,
-        latitude: f64,
-        longitude: f64,
-    },
-    /// Aircraft transponder declares the aircraft is flying at a given altitude
-    Flying {
-        datetime: PrimitiveDateTime,
-        latitude: f64,
-        longitude: f64,
-        altitude: f64,
-    },
-}
-
-impl Position {
-    pub fn latitude(&self) -> f64 {
-        match *self {
-            Position::Flying { latitude, .. } | Position::Grounded { latitude, .. } => latitude,
-        }
-    }
-
-    pub fn longitude(&self) -> f64 {
-        match *self {
-            Position::Flying { longitude, .. } | Position::Grounded { longitude, .. } => longitude,
-        }
-    }
-
-    pub fn pos(&self) -> (f64, f64) {
-        (self.latitude(), self.longitude())
-    }
-
-    pub fn altitude(&self) -> f64 {
-        match *self {
-            Position::Flying { altitude, .. } => altitude,
-            Position::Grounded { .. } => 0.0,
-        }
-    }
-
-    pub fn datetime(&self) -> PrimitiveDateTime {
-        match *self {
-            Position::Flying { datetime, .. } => datetime,
-            Position::Grounded { datetime, .. } => datetime,
-        }
-    }
-}
-
 /// Returns an iterator of [`Position`] over the trace of `icao` on day `date` assuming that
 /// a flight below `threshold` feet is grounded.
 pub fn positions(
diff --git a/src/legs.rs b/src/legs.rs
index 27a6758..02da248 100644
--- a/src/legs.rs
+++ b/src/legs.rs
@@ -6,6 +6,20 @@ use crate::Position;
 pub struct Leg {
     pub from: Position,
     pub to: Position,
+    /// in feet
+    pub maximum_altitude: f64,
+}
+
+impl Leg {
+    /// Leg geo distance in km
+    pub fn distance(&self) -> f64 {
+        self.from.distace(&self.to)
+    }
+
+    /// Leg duration
+    pub fn duration(&self) -> time::Duration {
+        self.to.datetime() - self.from.datetime()
+    }
 }
 
 /// Returns a set of [`Leg`]s from a sequence of [`Position`]s.
@@ -16,13 +30,16 @@ pub fn legs(mut positions: impl Iterator<Item = Position>) -> Vec<Leg> {
 
     let first = prev_position;
     let mut legs: Vec<Leg> = vec![];
+    let mut maximum_altitude = prev_position.altitude();
     positions.for_each(|position| {
+        maximum_altitude = position.altitude().max(maximum_altitude);
         match (prev_position, position) {
             (Position::Grounded { .. }, Position::Flying { .. }) => {
                 // departed, still do not know to where
                 legs.push(Leg {
                     from: prev_position,
                     to: prev_position,
+                    maximum_altitude,
                 });
             }
             (Position::Flying { .. }, Position::Grounded { .. }) => {
@@ -35,7 +52,9 @@ pub fn legs(mut positions: impl Iterator<Item = Position>) -> Vec<Leg> {
                     legs.push(Leg {
                         from: first,
                         to: position,
-                    })
+                        maximum_altitude,
+                    });
+                    maximum_altitude = 0.0
                 }
             }
             _ => {}
@@ -43,9 +62,9 @@ pub fn legs(mut positions: impl Iterator<Item = Position>) -> Vec<Leg> {
         prev_position = position;
     });
 
-    // if it is still flying, we leave the last leg as incomplete.
+    // if it is still flying, remove the incomplete leg
     if matches!(prev_position, Position::Flying { .. }) && !legs.is_empty() {
-        legs.last_mut().unwrap().to = prev_position;
+        legs.pop();
     }
 
     legs
diff --git a/src/lib.rs b/src/lib.rs
index b353edb..d0690f7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -19,9 +19,84 @@ pub use legs::*;
 pub use model::*;
 pub use owners::*;
 
+/// A position of an aircraft
+#[derive(Debug, Clone, Copy)]
+pub enum Position {
+    /// Aircraft transponder declares the aircraft is grounded
+    Grounded {
+        datetime: time::PrimitiveDateTime,
+        latitude: f64,
+        longitude: f64,
+    },
+    /// Aircraft transponder declares the aircraft is flying at a given altitude
+    Flying {
+        datetime: time::PrimitiveDateTime,
+        latitude: f64,
+        longitude: f64,
+        altitude: f64,
+    },
+}
+
+impl Position {
+    pub fn latitude(&self) -> f64 {
+        match *self {
+            Position::Flying { latitude, .. } | Position::Grounded { latitude, .. } => latitude,
+        }
+    }
+
+    pub fn longitude(&self) -> f64 {
+        match *self {
+            Position::Flying { longitude, .. } | Position::Grounded { longitude, .. } => longitude,
+        }
+    }
+
+    pub fn pos(&self) -> (f64, f64) {
+        (self.latitude(), self.longitude())
+    }
+
+    pub fn altitude(&self) -> f64 {
+        match *self {
+            Position::Flying { altitude, .. } => altitude,
+            Position::Grounded { .. } => 0.0,
+        }
+    }
+
+    pub fn datetime(&self) -> time::PrimitiveDateTime {
+        match *self {
+            Position::Flying { datetime, .. } => datetime,
+            Position::Grounded { datetime, .. } => datetime,
+        }
+    }
+
+    /// Returns the distance to another [`Position`] in km
+    pub fn distace(&self, other: &Self) -> f64 {
+        distance(self.pos(), other.pos())
+    }
+}
+
 /// Returns the distance between two geo-points in km
 fn distance(from: (f64, f64), to: (f64, f64)) -> f64 {
     let from = geoutils::Location::new(from.0, from.1);
     let to = geoutils::Location::new(to.0, to.1);
     from.distance_to(&to).unwrap().meters() / 1000.0
 }
+
+/// An iterator between two [`time::Date`]s in increments
+pub struct DateIter {
+    pub from: time::Date,
+    pub to: time::Date,
+    pub increment: time::Duration,
+}
+
+impl Iterator for DateIter {
+    type Item = time::Date;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.from >= self.to {
+            return None;
+        }
+        let maybe_next = self.from.saturating_add(self.increment);
+        self.from = maybe_next;
+        (maybe_next < self.to).then_some(maybe_next)
+    }
+}
diff --git a/tests/it/main.rs b/tests/it/main.rs
index 3323d75..a1ec3ae 100644
--- a/tests/it/main.rs
+++ b/tests/it/main.rs
@@ -44,3 +44,22 @@ fn acceptance_test_emissions() {
     let emissions = flights::emissions(berlin, brussels, flights::Class::First);
     assert!(abs_difference(emissions, expected) / expected < accepted_error);
 }
+
+#[test]
+fn legs_() -> Result<(), Box<dyn Error>> {
+    let positions = flights::positions("459cd3", &date!(2023 - 11 - 17), 1000.0)?;
+    let legs = flights::legs(positions.into_iter());
+    let legs = legs
+        .into_iter()
+        // ignore legs that are too fast, as they are likely noise
+        .filter(|leg| leg.duration() > time::Duration::minutes(5))
+        // ignore legs that are too short, as they are likely noise
+        .filter(|leg| leg.distance() > 3.0)
+        // ignore legs that are too low, as they are likely noise
+        .filter(|leg| leg.maximum_altitude > 1000.0)
+        .collect::<Vec<_>>();
+
+    // same as ads-b computes: https://globe.adsbexchange.com/?icao=459cd3&lat=53.265&lon=8.038&zoom=6.5&showTrace=2023-11-17
+    assert_eq!(legs.len(), 5);
+    Ok(())
+}