Is there really such Russian saying??? It sounds so much non-Russian - I mean Russian grammar has so many prefixes and suffixes that it is natural for Russians to use them also when making new and funny expressions. Look at swearing - even the least educated person will use grammar extensively to modify those three four basic obscene words. :)
Um... выключить (to turn off) is more like "to key out", while включить (to turn on) is like "to key in", by analogy with вход (entrance) vs выход (exit). But I don't see any direct connection between выключить and ключ (a key), though yes, they have the same root.
In any case, neither of these words has anything to do with flights.