Reviving a very old thread...

We're looking at this for YYZ-LHR sometime in mid-2020, but trying to be super proactive. We have two cats, each around 9-11lbs. We would obviously prefer to put them under the seat - and are curious if buying PE helps with dimensions at all. Also, it seems that flying J is actually counterproductive in this case. We'll do a daytime flight and maybe get them something to make them sleepy for the trip.

Any recent experience here flying with cats?