It's common to use contractions in the past perfect, for example:
I'd instead of I had
hadn't instead of had not
To form questions in the past perfect we change the order of the words.
Notice the order of the words plane and hadn't in the following examples:
The plane hadn't even taken off.
Had the plane taken off?
Had the plane not taken off?*
*Note we don't start a question with hadn't*
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