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Their primary responsibilities include working with customers, especially with tagging and handling carry-on baggage that must be checked, scanning tickets, and boarding and deplaning aircraft. But they also often double as check-in counter agents and can find themselves also working at the baggage claim office in smaller airports. Go online and look at different companies and types of airlines to find which would be the best fit for you. Here are some examples of things to look for in your initial search:  Look at international carriers if you have an interest in traveling out of the country. Figure out if you want to work for a budget or luxury airline. The differences may include the destinations flown to and the comfort in the plane itself (seat size, leg room, tray table size). Find the size of the airline that will be best for you. Some airlines have tens of thousands of employees (United, Lufthansa, Qatar) while others, such as local carriers, can be quite small. The larger airlines usually fly to more destinations and tend to have international routes, but smaller airlines can offer a more “family feel” and can give you the opportunity to check-in repeat customers and make friends.  Research any specific airlines that you may have a set interest in. If you want to stay in your current location, you should check for positions at your local airport and at the airlines operating there. If you have a specific location in mind then search at the closest airports to it. Also, use a search engine that specializes in aviation jobs such as http://us.aviationjobsearch.com/.
Learn what an airline gate agent's duties are. Find the right airline for you. Look for an airline gate agent position.