Aeronautics avert rail disaster (3,6)

I believe the answer is:

air travel

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'aeronautics' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'avert rail disaster' is the wordplay.
'disaster' is an anagram indicator.
'avert'+'rail'='avertrail'
'avertrail' anagrammed gives 'AIR TRAVEL'.

Can you help me to learn more?

(Another definition for air travel that I've seen is " trips up?".)

I've seen this clue in the Sydney Morning Herald.

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