(1959, Cary Grant)

Features Chicago Greyhound Station. The opening credits include this street scene:

At the end of the opening credits a man tries and fails to get on a green/cream bus as the doors slam in his face - he is played by Alfred Hitchcock. 2930 was a GMC 'Old Look' TDH4509 new to New York City Omnibus in 1949. It's seen here in the livery of Fifth Avenue Coach Lines.

A similar vehicle appears briefly:

Before the famous attack by a crop-spraying aircraft, Cary Grant is set down in the middle of nowhere from a Greyhound Scenicruiser:

Another bus, a Flxible BR-29, also stops briefly. Note that the soundtrack of the Scenicruiser is re-used for the Flxible! This bus is still in use, converted to an RV: