Meaning trap
take off
plane leaves the ground
When a plane leaves the ground and starts flying.

Don't mix these meanings
Same phrase, different job.
When a plane leaves the ground and starts flying.
Another meaning of 'take off' is 'become successful'; compare the examples to keep the meanings separate.
Hear it in context
Notice where the phrase sounds natural.
The plane will take off in a few minutes.
During my last holiday, our flight took off late because of bad weather.
Fix the pattern
One small grammar move makes it sound right.
Not: The plane took off at Gatwick.
Say: The plane took off from Gatwick.
For the departure point use 'take off FROM a place'; 'at' is only for the time.
Which sounds natural?
Tap the one a native speaker would say.
'Take off' is the everyday verb for a plane leaving the ground; 'became airborne' is technical.
Build natural chunks
Words that usually travel with it.
take off + flight
- on time
- from Gatwick
- smoothly
- late
Don't confuse it
Related
Other meanings and phrases to compare.
- take off (become successful) — Another meaning of 'take off' is 'become successful'; compare the examples to keep the meanings separate.