Airport trips are among the most profitable rides for ride-hailing drivers.Waymo One's robotaxis that operate at airports could pose a threat to human drivers' earnings.Waymo One is expanding to offer airport trips in Phoenix and other markets subject to approval.If these robotaxis continue expanding further in the airport transport, they could severely impact human ride-hailing drivers’ earnings.In Phoenix, Waymo One already provides thousands of trips each week to and from Phoenix Sky Harbor International Airport.Waymo’s robotaxis are also contributing to congestion at Phoenix airport.In Los Angeles and San Francisco, robotaxis are still restricted from airports.Waymo One is the only company operating autonomous vehicles at US airports and the largest autonomous taxi service provider in the US.Airport rides constitute drivers' 'bread and butter' and they remain important for on-demand services.The growing competition from both human and robot drivers is already challenging human drivers’ profitability around the world.