A photo circulating on the Internet has rekindled the debate over passengers that some consider "too fat to fly."
In the photo, allegedly taken by an American Airlines flight attendant, a very large man is spilling out over his armrest (he actually appears to be sitting on it) and filling half of the aisle. Not only does it look really uncomfortable for the passenger -- and the passenger next to him -- but it also seems like a safety hazard.
Daly writes that he doesn't know what "the actual outcome was, but it seems unimaginable that he was allowed to fly in the end."
There was no further information about who the flight attendant might be or whether the man was asked to move before the flight took off.
American Airlines spokesman Tim Smith said the airline cannot verify the authenticity of the photograph or know who might have taken it. He added that the airline has a policy that "tries to be flexible for passengers of size."
"Certainly no passenger would ever be allowed to fly in any way that obstructs the aisles of the aircraft," Smith wrote in an e-mail to ABCNews.com. "It is very obvious in the photo that the aircraft is not in-flight at the time the photo was taken -- other passengers are still boarding and several overhead bins are still open."
American, like most other airlines, has a policy for larger passengers. Roughly speaking, most airlines try to make accommodations for passengers if the person's body is large enough that it prevents the armrest between the seats from being fully lowered.
American tries not to charge passengers for an extra seat unless there are simply no other options.
If the flight is not full, American tries to seat the passenger in two adjacent seats. Otherwise, the airline tries to book the person on another flight. If there is no other available flight or the passenger needs to be on that flight for scheduling reasons, the airline will sometimes book and charge the person for two seats.
The airline said each situation is handled individually on a case-by-case basis.
The Federal Aviation Administration also has rules about larger passengers: All passengers must wear seat belts, a passenger cannot be seated in an emergency exit row seat if a seatbelt extension is required, and no aisle may be blocked by a passenger or bags in case of an emergency.
"I think most airlines have it right with a policy of armrests being able to come all the way down for oversized passengers and requiring a second ticket purchase if not, while re-accommodating and refunding the second ticket if two seats are open at departure time," said Rick Seaney, CEO of travel site FareCompare.com and an ABCNews.com columnist. "That is until such point when being oversized is considered a disability."
Seaney said the issue boils down to cost and enforcement.