>>1190320Such pictures would usually be taken from a single or twin seat turboprop like a Super Tucanno. They're fast and agile enough to fly close to civil airliners and can be used to keep up with a lot of civil airliners at or below FL100.
Aircraft manufacturers like Airbus an Boeing buy these single or twin seat turboprops to allow for in flight testing and for an engineer to perform a visual inspection of the underside in flight or for photographs to be taken.
