it depends on the airline -- some allow it -- others don't. American Airlines does allow cats in the cabin -- under the seat in their carrier.
My cat didn't need to go potty until we got to the motel room -- he was able to hold it.
The BIGGEST problem -- is the god damned security check points. My cat is laid back -- but his halter has metal which will set off the damned sensors -- the some idiots working do have fits. So you have to remove the halter. If your cat is a easily frightened and need the extra holding points that a halter gives you -- you can remove all metal hooks. This halter is for you to hang on to her. Find a way to hang on to her -- so that you won't get scratched up. The problem is that you have to take her out of her carrier -- and CARRY her through the metal scanners and then place her back in the carrier.
You will need to figure out how to calm your cat and keep yourself calm -- and if she is badly frightened you will have to HOLD ON to her. You may need to put a set of nail guards (what ever they're called) so you don't get scratched when she is frightened. You may need to put her in a towel -- in order to get past the check point -- so you don't get scratched because the noise and people will frighten her. She will probably pick up the negative emotions at this check point.
My cat is very laid back -- and even he was bothered by being removed from his carrier and all the noise really bothered him. I held both him and his buddy closely and got through the checkpoint. On the other side the security worker did open the carrier for me and held it while I put him and his buddy back in. I did this twice in May and once in December.
I had a German Vet who gave the cat a very mild sedative -- because he get car sick. This would be like a benadryl -- very mild.
You need an airline approved carrier -- and a health certificate.
You will need to practice getting the cat out of the carrier -- and get the cat used to a harness (with no metal) and lead connected to the harness (no mental) -- and then getting the cat BACK in the carrier.
There is a really neat wheeled carrier -- that is also a back-back and this fits nicely under airline seats. I used this carrier the last time I flew with my cat -- I highly recommend this combination carrier!
The other option is putting your baby in cargo -- my baby is 6 pounds and I wouldn't never consider putting him in the hole of an airplane.
Yes you can fly with your cat -- I've done it. In fact my cat did really well.
Some advice here
http://www.petswelcome.com/milkbone/frameairtrav.htmlAt the left on this website above you'll find a list of airlines.
It will cost between $50 and $100 to take your cat with you.
Good luck -- start practicing -- get her used to the carrier and used to noisy places now.