You may think because you are holding a first class or business class American Airline ticket in your hand you will be granted access to American Airline's Admirals Club Lounge(economy or premium economy ticket holders are not allowed access). Well, you may be in for a surprise when you try to enter the lounge.
First of all if you are traveling on a domestic ticket – forget it. The lounge is for international travelers only.
But what if you are traveling to an international destination, no problem then right? Not so fast. If you are traveling between the Untied States and Mexico (except Mexico City), the Caribbean or Canada, you will not be allowed to use the lounge. Even though according to immigration these destinations are considered international and you will need your passport to travel there, American Airlines will not allow you to use their lounge.
Ok, so what if you are traveling from the United States to another country, other then Canada, Mexico or the Caribbean, and you have a connecting flight that code shares with American Airlines which happens all the time. For example you may be traveling from Chicago to Los Angeles on American Airlines for the first leg of your trip and from Los Angeles to Fiji on Fiji Airways for the second leg of the trip.
Everything seems fine, you booked an American Airlines ticket to an international destination in business class so you head to the Admirals Club Lounge only to find you are denied access. The reason, Fiji Airways is not a Oneworld member and American Airlines doesn't recognize airlines who aren't Oneworld members therefore they only recognize the portion of your ticket being flown on American Airlines which unfortunately was completed all within the United States and was therefore a "domestic" ticket. And you are denied entrance.
The moral of the story is make sure you read the fine print. If you are planning on using the airlines lounge make sure you know all of the rules and restrictions and make sure all of your flights qualify you for entrance.