I always try to stand in a particular door way (worry not, I step out of the way for those coming and going) in a particular carriage so my progress from the train to the station exit is brief. It also allows me to see planes making their approach to LaGuardia Airport when coming home to Brooklyn in the evenings at the first above-ground stop, Smith St.-9th St.

But the sky is what I look at.
Especially the lights of aircraft preparing to land. On a heavy traffic day, whether twilight or dusk, the lights appear as a giant string of pearls spaced far apart.
They too are coming home.