Frontier Airlines tops list of most complained-about US carriers in 2022.

According to a recent ranking by WalletHub, Delta Airlines has been named the best US airline for the second year in a row, while Southwest Airlines was ranked the worst out of 11 US airlines. The ranking was based on 14 metrics across four categories, including baggage and departures, animal-related incidents, in-flight comfort and cost, and safety. The metrics that contributed the most to an airline's total score were delays, denied boardings, and price.