LOS ANGELES, CA - JUNE 04: A United Airlines Boeing 747 jet flies pas an American Airlines jet upon take-off at Los Angeles International Airport (LAX) on June 4, 2008 in Los Angeles, California. Because of record fuel prices, the nation's second largest air carrier announced that it will ground its entire fleet of 94 Boeing B737s and six 747s. United also announced plans to cut up to 1,100 more jobs and downsize its domestic capacity. (Photo by David McNew/Getty Images)

Madonna was flying on Air Portugal from London to Lisbon when they got diverted to Porto due to bad weather. Only then did the passengers of the aircraft discover the pop star with no make-up had been flying unnoticed in the cheap economy section.