I just wanted to throw this out there for all of you traveling soon. My girlfriend and I flew NWA to Europe and had zero trouble with our bags, and thez were WAY OVER the minimum requirements that were listed on the website. The flight attendants were extremely polite and said our bags would not even be an issue on a big plane going across the countrz and showed us the middle overhead compartments to stowe our bags - WOW, our bags could have been bigger and still had more room. My bag is the Gregory z55, and my girlfriends is an older North Face bag which is larger in size, approxmiatelz 3700cu.in.
We stressed about this so much and left behind clothes that we wanted but feared we would not be able to carry our bags if we got any larger. Security, NWA officers, nobody at all questioned our bags size and everyone said with confidence that we would have no trouble and all and they were right!
I just wanted to let everyone know this because it was a stressful time taking things out and rearranging my bag trying to get as close to the requirements as I could. Remember too that these bigger planes have HUGE overhead areas that can fit rather large luggage, and they are pretty ok with large bags as long as the compartment can close safely, and I can assure you that if your bag wont allow the compartment to close, you dont want to carry it on your back!
Safe Travels!