United Airlines paid business class travelers $10,000 in travel vouchers each to move from business class to Premium Plus for a Newark to Hawaii flight. //

Travelers involuntarily bumped from US flights can be entitled to compensation if they have confirmed reservations, check in to their flights online, arrive at the departure gate on time -- if their airline can't get them to their destination within one hour of the original flight's arrival time, according to the US Department of Transportation.

Passengers on US domestic flights experiencing a one to two hour delay in their arrival times can receive compensation equal to double the one-way price of their bumped flight -- up to $675.

Domestic passengers experiencing more than a two-hour delay on flights will receive payments of four times the one-way value of their flight -- up to $1,350.