The survey is based on 7, 000 booking requests for two seats at the lowest mileage level, now often called "saver" awards, at 25 airlines.

WSJ: Frequent-Flier Miles: Best Airlines for Cashing In

Some fliers set clocks to request free tickets at midnight 331 days, or about 11 months, before departure traditionally the moment airlines open a flight for booking only to find no seats available on popular flights.

WSJ: Frequent-Flier Miles: Best Airlines for Cashing In

The venue said if any of those customers who have booked for these shows can make alternative travel arrangements to get to the WMC and can present the ticket office with confirmation of their specific booking with Diamond Coaches and ID, they would be given seats.

BBC: Swansea's Diamond Coaches goes into administration

While airfare bargains during peak season will be few this summer, booking ahead will at least secure flights at the most convenient times and the best seats on the plane.

BBC: Deals to be found in May and beyond

The first is by selling seats on their own Web sites and together on Sabre's Travelocity, American Airlines' booking service.

ECONOMIST: Electronic commerce