Q. I have an airline voucher that I cannot use before it expires. Is it possible to book a flight and then cancel and somehow receive a new voucher to be used at a future date?

A. You can book a flight using the voucher before it expires and then you’d have up to a year from the ticket issue date to change the flight, if necessary. However, most airlines will charge a change fee, typically $150 on United, American, Delta and US Airways. There’s no change fee on Southwest, but you’d pay any applicable fare difference.