The Australian national carrier is marking its centenary with special discounted flight prices available for 100 hours.
The music producer and Black Eyed Peas frontman took to Twitter to complain about the behavior of a flight attendant on a Qantas Airways flight from Brisbane to Sydney in Australia.
"I thought with absolute certainty that we were going to crash. It was terrifying."
Staff were discouraged from using the words "wife" and "husband" because they "can reinforce the idea that people are always in heterosexual relationships."
The chief executive of Qantas said that Qataris traveling to Dubai would be offered "alternative routes" after the UAE cut ties with Qatar.
Airline chief Alan Joyce was one of 20 Australian business leaders to sign a letter in support of gay marriage in March.
"I'll need a good dry cleaner," Joyce said.