You should be fine. I flew from Australia yesterday and had no problems.
Can't carry any liquids on to international flights into the US, but you can on domestic flights, if you buy them in the airport. Liquids/ gels are restricted to 3oz, but camera equipment is the same as usual. Not allowed tripods in carry-on luggage - but I usually check that, packed into a suitcase/ wrapped in clothes.
I use a lowepro minitrakker and computrakker, which fits in the overhead bins.
http://www.tsa.gov/travelers/airtrav...ted-items.shtm