i am taking 2 13 yr olds on vacation. they are flying with me and my boyfriend to orlando, going on a cruise, spending some time at disney, and then flying home. however, my boyfriend and i are staying an extra week, so they need to fly home alone.. anyone ever have there kids fly alone? how does it work? they are my siblings, so im not sure if i have to have any extra paperwork to get them on the plane.. thanks