Wide body passengers will have to buy two seats to fly on United Airlines. And if extra seats are not available, extra hefty passengers will be grounded.  Eight airlines, including United, Delta and Southwest have similar seating policies.  Flight attendants are on the lookout for overweight passengers who can't buckle their seat belts or put their armrests down. Portly passengers call the policy discrimination, at a time when 34% of Americans are obese, according to the CDC.
United flights out of Nashville International are on United Express, a regional carrier with even smaller seats.
The Daily News puts it all in perspective.