work in american airports, request info

Thanks for the reply, I have visit the links and I have see a few job
opportunities.
Ok, I have a pair of question to ask..
First, in american airports the ramp / baggage handler agents depending
from airliners?
Second, is easy to find a job like ramp / baggage handler agent in the
major airports?
There are also particular restrictions for immigrants or anti terrorism
laws that circumscribe the assumption in the airports for only american
citizens?