Revenue measure fell for US Airways in Nov.

US Airways said today its revenue passenger miles, a key industry performance gauge, fell 4.6 percent last month compared with November 2006.

A revenue passenger mile is a paying customer flown one mile. The airline, which carries nearly two-thirds of the traffic at Philadelphia International Airport, said it flew 4.7 billion RPMs last month.

Capacity - the number of seats available - also fell 4.6 percent.

Meanwhile, the airline's passenger load factor - its percentage of occupied seats - fell 0.1 percentage point to 77.8 percent.

Its on-time performance was the highest of any month this year at 80.6 percent.

US Airways, of Tempe, Ariz., operates 3,700 flights a day. Its shares were down $1.18, or 6 percent, in mid-day trading at $18.44 on the New York Stock Exchange.