Is gershwin's Music in the Public Domain?

I ask because United Airlines still uses the music (“Rhapsody In Blue”) to advertise its services. Gershwin died over 75 years ago-are his works available to anybody?

Mostly not, for now: Are any George Gershwin songs in the public domain? - Answers

The Gershwin estate and the Rodgers and Hammerstein estate have been instrumental in extending the length of copyright protection in the US.

I see what you did there.

The MOUSE owns that movement.

I think you mean THE MOUSE©®™.