Do airlines still allow you to bring one carry-on bag, and if so, what is the maximum size allowed?

Yes you are allowed to bring one carry on with you. I would suggest as to the size that you check directly with you airline, as it may vary depending upon what type of aircraft that you will traveling on. I would suggest that you visit the TSA website prior to traveling so you make sure that you only have allowed items packed in your carry on a href="http://www.tsa.gov/" rel="nofollow"http://www.tsa.gov//a