As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCI - FLT 15 - DURING FLIGHT, EN ROUTE TO PHX FROM JFK, CREW REPORTED THAT THE CAPTAINS OXYGEN MASK INFLATE TUBE BROKE. CREW DIVERTED TO MCI AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE SWAPPED CAPTAINS O2 MASK WITH SECOND OBSERVERS MASK AND MEL'D THE SECOND OBSERVERS SEAT. MAINTENANCE CLEARED MEL BY SWAPPING MASKS BACK TO ORIGINAL POSITIONS AND REPLACING THE CAPTAINS OXYGEN MASK IAW AMERICA WEST AIRLINES TASK CARD R1B35301. OPERATIONAL TESTS WERE GOOD.