I think parachuters use the term "lock on altitude" for the altitude wher they pull the string. Obviously it doesn't have anything to do with this...
Just a question, referring to alternative (c): How can you fly "
between the lock-on altitude?"
I don't think I've never flown
between an altitude before.
Nick
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"I have found that alcohol taken in sufficient quantity produces all the effects of drunkenness."
~ Oscar Wilde