US Airline Carry-On Regulations are generally as follows:

You are permitted 1 Carry-On Item, and one "personal item" - typically a purse. A suit bag is permissible on some airlines IF there's room, otherwise, it will need to be checked bags.
see this link:
http://www.bobatkins.com/photography/carry_on_restrictions.html


You can bring a first air kit on board, however, you may not have liquids, knives or aerosols. For complete information see

http://www.tsa.gov/travelers/airtravel/prohibited/permitted-prohibited-items.shtm