With the number of flights increasing since last year, it seems more people than ever are relying on air travel to get around. Thankfully, airlines are happy to accommodate those who need or want to fly but have special circumstances—or so these companies claim.

The U.S. Department of Transportation on Wednesday announced a $50 million fine against American Airlines for its alleged mistreatment of passengers with disabilities, which the department said in some cases caused injuries.

The Transportation Department issued the fine after an investigation revealed “cases of unsafe physical assistance that at times resulted in injuries and undignified treatment of wheelchair users.”