Maybe I missed it before, but this thread
http://www.flyertalk.com/forum/delta...imensions.html
has this:
Code:
25 DCI OVERHEAD DIMENSIONS
26 -------------------------------------------------------
27 AT7 42L X 8W X 14H
28 CR7 43L X 16W X 8H
29 CRJ 43L X 16W X 8H
30 EM2 31L X 16W X 8H
31 RJ9 42L X 12W X 12H
32 ERJ 63L X 20W X 9H
33 ER3 63L X 20W X 9H
34 E70 24L X 16W X 10H
35 ---------------------------- REVISED/20AUG07/ATLHGDL/AH
So I'm guessing that a 22x14x9 would fit as long as it wasn't packed to full and could compress some to become slimmer.