Quonsett hut

Da humorous name dat they would refer to da 8X8 cell dat da infamous Ada would have had to live in if she'd got put in da slammer for her repeated airline-stowaway crimes.

While it's certainly true dat a Quonsett hut might not be da most comfy domicile, at least it would have a rounded top like a passenger-plane's fuselage, and so it would remind da occupant of her heady exciting life as a freeloader on commercial airliners!