I wouldn't take a chance with that, to be honest, unless you don't mind the possibility of having to check it. LV states that this is their largest cabin size Keepall, and most airlines put a restriction on the size of cabin baggage that puts the 55 at the largest accepted size. No checking LV for me, so that's as big as I'd go!
If you don't already have a 60, buy the 55 (I now have a 55, too). When I got my 60, over 10 years ago, no one was talking about size limits on planes. Up until last year, I traveled with my 60 everywhere. Now, I use it for car/train trips only.
P.S. Keep in mind that while it would seem that a bigger would be better, unless you're able to carry the load without trouble or discomfort, it might be a good idea to think along the lines of a 45 or 50. As you might know, these bags are all very roomy, and if one gets carried away (no pun), they can get very heavy.
^ very à propos.I just posted some info/photos on how much I can fit into my 45 in this thread:
There is a mod shot too!