Herler AT-400
Herler Airlines is a Airline company, simiar to FlyUS, and is featured in Grand Theft Auto V.
Planes
The name of the plane is still unidentified, but the plane shown in Michael's trailer, in real life is a mix between the Boeing 747 and the Airbus A340-300.
It may be the AT-400 that is seen flying around in GTA SA and findable in the Las Venturas airport hanger.