This study presents a trendline analysis of disability-related complaints to determine patterns in potential violations of the Air Carrier Access Act reported by U.S. airlines from 2004 to 2019. The analysis revealed a 248.4% increase in the frequency of complaints by passengers with disabilities and a 170.4% increase in the rate of disability-related complaints. A year-over-year decrease in total disability-related complaints occurred three times between 2004 and 2011. However, since 2011, the complaint frequency and rate both increased yearly until 2019. These results demonstrate that passengers with disabilities continue to have their rights violated during air travel as U.S. airlines fail to fully comply with federal legislation designed to prohibit discrimination based on disability.