The most common and most likely answer to this crossword clue is the 9 letter word STAIRWELL
I've seen this crossword clue in The Daily Telegraph
S
T
A
I
R
W
E
L
L
More clues leading to the result STAIRWELL
- Place for flights? Primarily soaring through atmosphere successfully
- Where flights go in move to get around a fine
- Report to look really hard for flight location
- Air pocket occurring mid-flight?
- Flights here increase, preserving tense atmosphere
- Peer intently, we’re told, to see flight’s location
- American needs to mix effectively around communal area
- Flight case?
- Look hard, we’re told, and skilfully for flight location
- Space flight takes one into sun source
Buddy explains!

The straight part
We know that "Flight case?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flight case? = stairwell.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does STAIRWELL mean?
STAIRWELL noun- A shaft in a multi-story building enclosing a stairway or staircase.