DALLAS — Think flying is getting worse? A pair of university researchers who track the airline business say it’s a fact.

More flights are late, more bags are getting lost, and customers are lodging more complaints about U.S. airlines, government data shows. Dean Headley, a marketing professor at Wichita State and one of the co-authors of the annual report being released today, said passengers already know that air travel is getting worse. “We just got the numbers to prove it.” Among the findings:

• LATENESS: The percentage of flights that arrived on time fell to 76.2 percent last year from 78.4 percent in 2013. Best: Hawaiian Airlines. Worst: Envoy Air, which operates most American Eagle flights.

• LOST BAGS: The rate of lost, stolen or delayed bags rose 13 percent in 2014. Best: Virgin America. Worst: Envoy. Airlines lose one bag for every 275 or so passengers, but at Envoy, the rate is one lost bag for every 110 passengers, according to government figures.

• OVERBOOKING: The rate of passengers getting bumped from flights rose 3 percent. Best: Virgin America. Worst: a tie, between SkyWest and its ExpressJet subsidiary.

• COMPLAINTS: Consumer complaints to the government jumped 22 percent in 2014. Best: Alaska Airlines. Worst: Frontier.

Regional carriers, which operate flights under names like American Eagle and Delta Connection, tend to earn the worst marks. They fly smaller planes, so when airlines are forced to cut flights due to weather, they ground the regionals first to inconvenience fewer passengers.