diff --git a/.gitignore b/.gitignore
index 1728eda..114b535 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /target
 /Cargo.lock
 database/
+venv/
diff --git a/Cargo.toml b/Cargo.toml
index 5808a3c..17a18ff 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -45,3 +45,4 @@ clap = { version = "4.4.6", features = ["derive"] }
 tokio = {version="1.0", features=["rt", "macros", "rt-multi-thread"]}
 simple_logger = "*"
 num-format = "*"
+itertools = "*"
diff --git a/examples/export_legs.rs b/examples/export_legs.rs
new file mode 100644
index 0000000..4a8d0e7
--- /dev/null
+++ b/examples/export_legs.rs
@@ -0,0 +1,90 @@
+use std::error::Error;
+
+use clap::Parser;
+use futures::StreamExt;
+use itertools::Itertools;
+use simple_logger::SimpleLogger;
+
+use flights::{load_aircrafts, load_private_jet_types};
+
+#[derive(clap::ValueEnum, Debug, Clone)]
+enum Backend {
+    Disk,
+    Azure,
+}
+
+const ABOUT: &'static str = r#"Builds the database of all private jet positions from 2023"#;
+
+#[derive(Parser, Debug)]
+#[command(author, version, about = ABOUT)]
+struct Cli {
+    /// The Azure token
+    #[arg(short, long)]
+    azure_sas_token: Option<String>,
+    #[arg(short, long, value_enum, default_value_t=Backend::Azure)]
+    backend: Backend,
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn Error>> {
+    SimpleLogger::new()
+        .with_level(log::LevelFilter::Warn)
+        .init()
+        .unwrap();
+
+    let cli = Cli::parse();
+
+    // optionally initialize Azure client
+    let client = match (cli.backend, cli.azure_sas_token.clone()) {
+        (Backend::Disk, None) => None,
+        (Backend::Azure, None) => Some(flights::fs_azure::initialize_anonymous(
+            "privatejets",
+            "data",
+        )),
+        (_, Some(token)) => Some(flights::fs_azure::initialize_sas(
+            &token,
+            "privatejets",
+            "data",
+        )?),
+    };
+
+    // load datasets to memory
+    let aircrafts = load_aircrafts(client.as_ref()).await?;
+    let types = load_private_jet_types()?;
+
+    let private_jets = aircrafts
+        .values()
+        // its primary use is to be a private jet
+        .filter(|a| types.contains_key(&a.model))
+        .collect::<Vec<_>>();
+
+    let months = (2023..2024)
+        .cartesian_product(1..=12u8)
+        .map(|(year, month)| {
+            time::Date::from_calendar_date(year, time::Month::try_from(month).unwrap(), 1)
+                .expect("day 1 never errors")
+        })
+        .collect::<Vec<_>>();
+
+    let required = private_jets
+        .into_iter()
+        .cartesian_product(months.into_iter())
+        .collect::<Vec<_>>();
+
+    let tasks = required.into_iter().map(|(aircraft, month)| {
+        flights::month_positions(month, &aircraft.icao_number, client.as_ref())
+    });
+
+    futures::stream::iter(tasks)
+        // limit concurrent tasks
+        .buffered(10)
+        // continue if error
+        .map(|r| {
+            if let Err(e) = r {
+                log::error!("{e}");
+            }
+        })
+        .collect::<Vec<_>>()
+        .await;
+    Ok(())
+}
diff --git a/src/fs_azure.rs b/src/fs_azure.rs
index 03fedcd..e45c235 100644
--- a/src/fs_azure.rs
+++ b/src/fs_azure.rs
@@ -5,7 +5,7 @@ pub use azure_storage_blobs::prelude::ContainerClient as _ContainerClient;
 use crate::fs::BlobStorageProvider;
 
 pub struct ContainerClient {
-    client: _ContainerClient,
+    pub client: _ContainerClient,
     can_put: bool,
 }
 
@@ -77,16 +77,28 @@ pub(crate) async fn cached_call<F: futures::Future<Output = Result<Vec<u8>, std:
     fetch: F,
     action: crate::fs::CacheAction,
     client: Option<&ContainerClient>,
-) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
+) -> Result<Vec<u8>, std::io::Error> {
     let Some(client) = client else {
-        return Ok(crate::fs::cached(&blob_name, fetch, &crate::fs::LocalDisk, action).await?);
+        return Ok(
+            crate::fs::cached(&blob_name, fetch, &crate::fs::LocalDisk, action)
+                .await
+                .map_err(std::io::Error::other)?,
+        );
     };
 
-    let Some(data) = client.maybe_get(blob_name).await? else {
+    let Some(data) = client
+        .maybe_get(blob_name)
+        .await
+        .map_err(std::io::Error::other)?
+    else {
         return Ok(if !client.can_put() {
-            crate::fs::cached(&blob_name, fetch, &crate::fs::LocalDisk, action).await?
+            crate::fs::cached(&blob_name, fetch, &crate::fs::LocalDisk, action)
+                .await
+                .map_err(std::io::Error::other)?
         } else {
-            crate::fs::cached(&blob_name, fetch, client, action).await?
+            crate::fs::cached(&blob_name, fetch, client, action)
+                .await
+                .map_err(std::io::Error::other)?
         });
     };
     Ok(data)
diff --git a/src/icao_to_trace.rs b/src/icao_to_trace.rs
index 561d405..3bb5824 100644
--- a/src/icao_to_trace.rs
+++ b/src/icao_to_trace.rs
@@ -1,5 +1,4 @@
 use std::collections::HashMap;
-use std::error::Error;
 use std::sync::Arc;
 
 use futures::{StreamExt, TryStreamExt};
@@ -84,8 +83,8 @@ async fn globe_history(icao: &str, date: &time::Date) -> Result<Vec<u8>, std::io
     headers.insert("Sec-Fetch-Site", "same-origin".parse().unwrap());
     headers.insert("TE", "trailers".parse().unwrap());
 
-    // Retry up to 3 times with increasing intervals between attempts.
-    let retry_policy = ExponentialBackoff::builder().build_with_max_retries(3);
+    // Retry up to 5 times with increasing intervals between attempts.
+    let retry_policy = ExponentialBackoff::builder().build_with_max_retries(5);
     let client = ClientBuilder::new(reqwest::Client::new())
         .with(RetryTransientMiddleware::new_with_policy(retry_policy))
         .build();
@@ -125,7 +124,7 @@ async fn globe_history_cached(
     icao: &str,
     date: &time::Date,
     client: Option<&fs_azure::ContainerClient>,
-) -> Result<Vec<u8>, Box<dyn Error>> {
+) -> Result<Vec<u8>, std::io::Error> {
     let blob_name = cache_file_path(icao, date);
     let action = fs::CacheAction::from_date(&date);
     let fetch = globe_history(&icao, date);
@@ -149,7 +148,7 @@ pub async fn trace_cached(
     icao: &str,
     date: &time::Date,
     client: Option<&fs_azure::ContainerClient>,
-) -> Result<Vec<serde_json::Value>, Box<dyn std::error::Error>> {
+) -> Result<Vec<serde_json::Value>, std::io::Error> {
     let data = globe_history_cached(icao, date, client).await?;
 
     let mut value = serde_json::from_slice::<serde_json::Value>(&data)?;
@@ -171,7 +170,7 @@ pub async fn positions(
     icao_number: &str,
     date: time::Date,
     client: Option<&fs_azure::ContainerClient>,
-) -> Result<impl Iterator<Item = Position>, Box<dyn Error>> {
+) -> Result<impl Iterator<Item = Position>, std::io::Error> {
     use time::ext::NumericalDuration;
     let icao: Arc<str> = icao_number.to_string().into();
     trace_cached(icao_number, &date, client)
@@ -214,7 +213,7 @@ pub(crate) async fn cached_aircraft_positions(
     to: Date,
     icao_number: &str,
     client: Option<&super::fs_azure::ContainerClient>,
-) -> Result<HashMap<Date, Vec<Position>>, Box<dyn Error>> {
+) -> Result<HashMap<Date, Vec<Position>>, std::io::Error> {
     let dates = super::DateIter {
         from,
         to,
@@ -222,7 +221,7 @@ pub(crate) async fn cached_aircraft_positions(
     };
 
     let tasks = dates.map(|date| async move {
-        Result::<_, Box<dyn Error>>::Ok((
+        Result::<_, std::io::Error>::Ok((
             date.clone(),
             positions(icao_number, date, client)
                 .await?
@@ -237,4 +236,4 @@ pub(crate) async fn cached_aircraft_positions(
         .await
 }
 
-pub use crate::trace_month::aircraft_positions;
+pub use crate::trace_month::*;
diff --git a/src/trace_month.rs b/src/trace_month.rs
index 9a8c88e..453c15b 100644
--- a/src/trace_month.rs
+++ b/src/trace_month.rs
@@ -35,8 +35,8 @@ fn get_month(current: &time::Date) -> (time::Date, time::Date) {
     (first_of_month, first_of_next_month)
 }
 
-async fn month_positions(
-    month: &time::Date,
+pub async fn month_positions(
+    month: time::Date,
     icao_number: &str,
     client: Option<&super::fs_azure::ContainerClient>,
 ) -> Result<HashMap<Date, Vec<Position>>, Box<dyn Error>> {
@@ -49,9 +49,7 @@ async fn month_positions(
 
     // returns positions in the month, cached
     let fetch = async {
-        let positions = cached_aircraft_positions(from, to, icao_number, client)
-            .await
-            .unwrap();
+        let positions = cached_aircraft_positions(from, to, icao_number, client).await?;
 
         let positions = positions
             .into_iter()
@@ -94,7 +92,7 @@ pub async fn aircraft_positions(
 
     let tasks = months
         .into_iter()
-        .map(|month| async move { month_positions(&month, icao_number, client).await });
+        .map(|month| async move { month_positions(month, icao_number, client).await });
 
     let positions = futures::stream::iter(tasks)
         // limit concurrent tasks