For example, Southwest offers senior deals on most flights, but sometimes they may not be the lowest you’ll actually pay. For instance, SW periodically offers special fares with a three-day deadline. If you’ve already bought a ticket earlier for the same flight, the price you paid could be $100 or more higher. Keep daily checking, and if the flight is later advertised at a lower rate, contact SW or your travel agent. Ask to get the credit applied for a future SW flight.