Because of the planes, he had to use underground garages.
5 seconds sound clip from the Casino (1995) movie soundboard.
You can hear this line at 01:51:43 in the Blu-ray version of the movie.
Quote context
[...]
- I saw something. Something very cute.
- Okay, he's out. It's the ant. Brown unit.
- And he's with the bogey. I think it's Frankie.
- Nicky started out before me because it wasn't that easy for him to get around anymore.
- Because of the planes, he had to use underground garages.
- Meeting in the middle of the desert always made me nervous. It's a scary place.
- Normally, my prospects of comin' back alive from a meetin' with Nicky were 99 out of 100.
- But this time, when I heard him say a couple of hundred yards down the road I gave myself 50-50.
- Where the fuck you get off talkin' to people behind my back, goin' over my head?
[...]