Plane projection frames inverted position in mind's eye to begin with (5,3)

I believe the answer is:

jumbo jet

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'plane' is the definition.
(I have seen 'Big plane' mean 'jumbo jet' so perhaps 'plane' could also mean 'jumbo jet')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for jumbo jet that I've seen before include "Big plane" , "Large plane" , "Flier" , "Large aircraft" , "Owner of trunk" .)

I've seen this clue in The Independent.

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