How flight times are calculated and verified
A public record of the calculation model, source roles, publishing standards and limitations behind every route page.
Flight-time model
Default route pages calculate great-circle distance with the haversine formula and a mean Earth radius of 6,371.0088 km. Time then uses an assumed 805 km/h (500 mph) cruise speed plus 30 minutes for take-off, climb, descent and landing.
This is a planning estimate. It is not scheduled block time and it does not include a connection or layover.
Reviewed route evidence
When a route has separately reviewed duration evidence, the route page can show the sourced range, source link and review date instead of silently mixing it with the calculation model.
Geographic sources
Airport reference data comes from OurAirports, while country labels and supporting country metadata come from REST Countries.
Airport coordinates are used as points, not city-centre coordinates. Country and region pages use a representative arrival gateway and disclose that limitation.
US BTS route evidence. BTS reporting-carrier on-time data gives historical domestic nonstop flight observations and scheduled elapsed durations. It does not establish that flights operate today; it does not cover international routes. BTS is cited on every public page that uses this evidence.
Publishing scope
Not every mathematically possible airport pair belongs in the public search footprint. Publication is limited to approved destinations and meaningful US departure places with usable coordinates.
Current public set: 352 routes across 1,168 destination guides.
What this site does not infer
It does not say a nonstop service exists merely because two airports can be connected mathematically. It does not present a country centroid as an airline destination when a representative gateway is available. It does not turn a modelled duration into a live timetable.