According to the DOL at http://www.bls.gov/oco/ocos171.htm

"Median annual earnings of flight attendants were $43,440 in May 2004 (about $47/hour based on 75 hours month). The middle 50 percent earned between $31,310 and $67,590. The lowest 10 percent earned less than $23,450, and the highest 10 percent earned more than $95,850."

IMO FAs are paid far above a competitive market rate which proves the financial success of unionization.