What happens to ticket holders if an airline goes out of business or is liquidated through bankruptcy? Ticket holders are considered "unsecured creditors". As such, they are among the last people to get paid, if there is anything left after all the secured creditors (such as aircraft leasing companies) are paid. In most recent airline liquidations, ticket holders have gotten nothing. At most, they would get pennies on the dollar, at least if they bought their tickets in the USA.
If a bankrupt airline in the USA goes out of business, will other airlines have to honor their tickets? Yes, but only other USA-based airlines flying exactly the same routes (which there aren't in many cases), only if space is available (which it probably won't be in many cases), and only until 18 November 2005.