Wilson also dismisses concerns that passengers on round-the-world fares will face problems on June 1. "The issue is not about the round-the-world fares but that the e-ticket cannot exceed 16 segments. But it is not a showstopper. Airlines are redefining these fares to keep below 16 segments, or are instructing agents to ticket by effectively combining two e-tickets into a single fare."

The other solution, which is already in use, says Wilson, is for travel agencies to issue multipurpose documents that allow travel.