Delta Airlines is facing a $2 million fine by U.S. Department of Transportation.
The sanction is a result of poor treatment of disabled travelers and lax response to written complaints about the incidents.
They occurred in 2007 and 2008.
Federal laws set standards for how airlines treat disabled people.
The Atlanta-based carrier says it has made significant investment in technology and training since the violations.
Atlanta disability advocate Hilary Elliott suffers from multiple sclerosis that keeps her in a wheelchair full-time.
She says she doubts Delta will make significant improvements:
“I wish I could say I saw it making a difference, but I don’t.”
Elliott says there still isn’t enough training for airline employees.