What if your airline requires 25,000 miles for a free ticket to Australia, and you only have 24,000?

Most airlines require that your pet's clean bill of health be no more than 10 days old.

All the airlines except United require a flight in connection with the stay.

In 1994, airlines required only 20,000 miles for a free ticket.

To succeed, the airline may require more capital than is readily available, analysts said.

The airlines require that the pet remain inside the bag during the flight.

If the heir is not the spouse, the airline requires a copy of the will.

The airline had required that free tickets be used by only the fliers or their relatives.

Some airlines require a death certificate; others also want copies of the will.

Some airlines may require a person on oxygen therapy to travel with a companion.