Oxygen Mask Failure

What: American Airlines Boeing 757 Flight 31 Honolulu-bound airliner
Where: emergency landing at Los Angeles International Airport
When: The flight took off at 8:48 a.m but returned 57 minutes later
Who: The flight was carrying 188 passengers and six crew members. Six passengers were examined for possible minor injuries.
Why: There was some type of smoke odor in the cabin,

Note Fire trucks were supposed to spray streams of water to welcome an Airbus A380 — the world's largest jetliner — flown by Emirates Airlines, but the emergency delayed the Emirates flight.


Update
Oxygen mask failures aboard Boeing 757s and 737s have been the target of an FAA air-worthiness directive, so its not a completely unexpected fact that almost half the masks on American Flight 31 either did not deploy or failed to provide oxygen once passengers pulled the pin to activate the flow of air. Oil spilled on a compressor of one of the jet's engines caused an odor in the cabin, and precipitated an emergency landing--in which the oxygen masks failed.