Part of a flight

STAIR

You might climb this to board a plane or reach a higher floor.

The clue "Part of a flight" plays on the double meaning of "flight." While it might first make you think of an airplane journey, it’s actually hinting at a "flight of stairs"—a series of steps between two floors. The answer "STAIR" is a single step in that sequence, so it’s quite literally a part of a flight. The trick is recognizing the everyday phrase hidden in the wording.