After a United Airlines flight three years ago, Isabelle Briar ripped open her thumb as she pushed her wheelchair away from the gate. The airline had cracked the metal grip ring, leaving a sharp, protruding shard.The same airline ignored Cindy Otis’ complaint about damage to her power chair in 2006, responding weeks later and only after she had an attorney write a letter threatening to sue.In 2017, U.S.