Not the same regional jet, but I just flew four segments on USAirways regional jets, and I was stunned to find that my Red Oxx XS Aviator, which is 8 inches in depth if packed snugly and not to the gills, didn't easily slide into the overhead compartments on some of these regional jets. I got it to fit with a few shoves, but since I'd underpacked my bags, I wasn't expecting any issue at all. Some of the regional jet bins are seriously small.