Global airline alliances are a relatively new concept, and the three existing ones have naturally had to create their own rules. This week’s Mexicana Airlines decision to suspend ticket sales raised serious questions about Oneworld rules and requirements.

Why did the alliance insist publicly that all was fine at Mexicana just a day before the announcement? Did the carrier fail to give Oneworld a proper warning? On Tuesday, Mexicana filed for insolvency proceedings in Mexico and bankruptcy protection in the United States. That same day, Oneworld spokesman Michael Blunt issued a press release, assuring travelers that the Mexicana’s position in the alliance was “unaffected” by the developments…