From their website:
NO ON THE DAY SATURDAY TICKETS
Anyone planning to attend the Royal International Air Tattoo at RAF Fairford in Gloucestershire on Saturday, July 12, must buy their tickets in advance.
Organisers announced today that tickets will not be on sale at the Fairford gates on Saturday, July 12.
However, tickets are still available for both Saturday and Sunday from Ticketmaster as well as from selected branches of Barclays Bank, Robert Dyas and a number of Tourist Information Centres.
Air Tattoo spokesman Richard Arquati said buoyant ticket sales prompted the decision.
“We want to make sure that everyone who plans to come on Saturday has the chance to buy a ticket, but it is important to make sure we are ready and able to cope with the traffic.
We introduced day-specific tickets this year for the first time in order that we could monitor ticket sales. It is as a result of this monitoring that the decision not to sell on-the-day tickets on Saturday has been taken.”
“Our advice is: if you want to come to the Air Tattoo, buy now or come on Sunday when tickets should also be on sale at the gate.”