I am working on a project for school, and I am trying to find past flight data concerning the altitude of the aircraft over the duration of the flight. This will then be used to identify contrails in a Landsat image.
I can find past departures and arrivals easy enough, and Flight Aware keeps a record of altitude for flights from the past 7 days, but I'm looking for flights possibly back to a year in the past. Is it possible to get this information? Of course, the source has to be official and stand up to legal scrutiny.