Salt Lake City has the nation's eighth best airport. Detroit Metropolitan Airport ranks last and the airport in Tampa, Fla., is best among the nation's 36 top airports, according to a passenger survey.

The private survey by Los Angeles-based Plog Research Inc. was commissioned by the 36 big airports. Passengers were surveyed in the first six months of last year, and the study was completed late last year, but airport officials refused to release the findings. It was obtained last week by the Detroit News, which published a story Monday.Here's the top airports:

1. Tampa, Fla.; 2. Pittsburgh; 3. Charlotte, N.C.; 4. Nashville, Tenn.; 5. Denver; 6. Phoenix; 7. Las Vegas; 8. Salt Lake City; 9. Atlanta; 10. Baltimore; 11. Honolulu; 12. Seattle.