Pilots have begun flying the first in a series of three "Unknown" flight programmes at the Advanced World Aerobatic Championships in Ljungbyhed, Sweden today. The 1st Unknown is shown here. Unknown figures are chosen by 10 of the teams -- as determined by drawing of lots --- but all teams can submit a proposed sequence of figures. The one to be used is chosen by the International Jury from those submitted. The sequence cannot be practiced and must be provided to all pilots at least 24 hours before the flight programme begins. A total of three different Unknowns will be flown at AWAC, weather permitting.