Qatar Airways chief Akbar Al Baker hurriedly left a conference of aviation executives suddenly after news of the crisis in his country broke.
The high profile Al Baker was seen at a lavish welcome function at a hotel resort in Cancun, Mexico on Sunday night (Monday NZT) but wasn't at the meeting the following day.
Saudi Arabia, Bahrain, the United Arab Emirates (UAE) and Egypt announced they were breaking diplomatic relations with Qatar and told their nationals to leave the emirate within two weeks.
Saudi Arabia, Bahrain and Egypt closed all transport links with Qatar, banned Qatari planes from landing and forbade them from crossing their air space.
They allege the government of Qatar supports Islamic extremists in the region, claims that Qatar denies.