Pet Gear I-GO2 Sport Roller Backpack for Cats and Dogs, Misty Blue

What is the weight limit for this model, the sport?

Does the regular sport fit under an airline seat if you lay it on it's back? this version does have dimensions that should fit if you do this.

is this airline approved ???

Has anyone used this to hold a small parrot, conure or amazon? I plan on taking my gentle red lored on walks with it.