The most common and most likely answer to this crossword clue is the 6 letter word BLIMPS
I've seen this crossword clue in The Daily Telegraph
B
L
I
M
P
S
More clues leading to the result BLIMPS
- Old fogeys walk unsteadily, wearing blazers inside out
- Shifty Lib politicians becoming reactionary Conservatives
- Terribly pompous people relaxed entering The Bahamas
- Hollow balloons, frail inside?
- Balloons that will have minor problems carrying mass?
- Aircraft proceeds slowly following battle’s opening
- Boy hobbles on to airships
Buddy explains!

The straight part
We know that "Aircraft" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case aircraft = blimps.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 BLIMPS mean?
BLIMPS noun- An airship constructed with a non-rigid lifting agent container.
- (by extension) Any large airborne inflatable.
- An obese person.
- A person similar to the cartoon character Colonel Blimp; a pompous, reactionary British man.
- To expand like a blimp or balloon; to become fat.