- Associated Press - Sunday, May 15, 2011

PHOENIX (AP) — An American Airlines flight headed to Chicago was forced to return to Phoenix Sky Harbor International Airport on Sunday morning after the pilot reported light smoke in the cabin.

An airport spokeswoman says the pilot of Flight 1172 landed safely and returned to the gate. The MD-80 was carrying 140 passengers and five crewmembers.

Airline spokesman Jim Faulkner said mechanics believe the smoke came from a small fluid leak in an auxiliary power unit. They expected to fix the problem quickly and use the same plane to take the passengers to Chicago.

American’s website shows the flight departed at 10:01 a.m. MST. The airport said the pilot reported the emergency six minutes later.