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The diva reportedly asked to buckle his seat belt after a flight attendant is turned on, causing her to be warned by another crew member.
The rumour mill went into overdrive after the news of the row but played Whitney camp story.
A source close to the singer told E! News, "She was not drunk or on drugs, she is in the middle of filming a movie and flew across country to attend a charity event and return to filming. She was exhausted". Houston reportedly refused to buckle up, leaving a flight attendant to fasten the seatbelt herself. Delta Airlines have announced they are looking into the situation, but claim they "cannot comment on passenger or itinerary information".
Another source close to the singer has told Tmz.com the row was an "overreaction", saying. "She's still 100% sober and was on the way to Detroit for her first day of shooting a new movie".