The view outside this diner window looks similar to what one might see looking out of an airport waiting area window at night, i.e., runways with lights.
Luggage sitting on a cart on the street - reminiscent of what one would see at an airport.
It must be the case that the allusions to aircraft and flying in the movie have something to do with the 'closed-in' feel of the movie discussed in part 2: If Frank is like a rat in a machine, he would desire to escape his tight surroundings by metaphorically 'taking flight'.