Amazon confirmed that it voluntarily paused its Prime Air drone deliveries in Texas and Arizona, but downplayed the role of a reported crash of two drones in December at an Oregon testing facility as a factor in the decision.

Amazon has paused all drone deliveries in Arizona.Currently, Amazon’s Tolleson, Arizona, facility and College Station, Texas, facility are the only ones in the country that offer Air Prime.Air Prime uses autonomous drones to deliver packages weighing up to 5lbs to customers in 30 minutes or less.

Alaska Airlines is the only United States-based carrier that was in AirlineRatings' top 10—although Hawaiian, American, Delta and United were in the top 25.