I have some friends that live in Ireland. I really want them to travel over, but they are 15, 13 and 11. Does anyone know what airline companies will let them on without an adult?
We were planning for them to come on British Airways, and Aer Lingus, but one company lets them on and another doesn't!
Please help me!


The previous answers may be correct, but they don't address one important item. You don't say where you are, but this sounds like your friends will be traveling to another country.
Every country sets its own laws for entry and some have special restrictions for minors traveling alone or with only one parent. In addition to checking with airlines, your friends need to contact the embassy or nearest consulate for the country that they are visiting. If there are special requirements, and your friends don't comply with them, then the airline will refuse to let them board the aircraft.
There may be more to this than just the airline's policy.