Elon Musk (@elonmusk) mocked Delta Air Lines ($DAL) over its in-flight Wi-Fi, joking that the best way to “sandbox” an AI would be to put it on a Delta flight because it would have no chance of reaching the internet. The jab is the latest escalation in Musk’s criticism of Delta after the airline chose Amazon’s Leo satellite network instead of SpaceX’s Starlink. Musk has warned that Delta could lose customers as rival airlines adopt Starlink, pointing to United Airlines’ rollout across hundreds of aircraft. United has already installed Starlink on roughly 450 mainline and regional aircraft and is targeting broader fleet coverage by the end of 2027. Delta, meanwhile, plans to begin installing Amazon Leo on 500 aircraft in 2028. CEO Ed Bastian has described the system as a fast and cost-effective option that also builds on Delta’s existing relationship with Amazon Web Services. Delta already offers free Delta Sync Wi-Fi on more than 1,200 aircraft and says the service has logged more than 160 million customer sessions. The airline connectivity race is also expanding beyond Delta and United. American Airlines plans to install Starlink on more than 500 narrowbody aircraft beginning in 2027. Musk has said SpaceX ($SPCX) has accepted lower-revenue airline deals to make Starlink easier for passengers to use, turning in-flight internet into another major battleground for satellite connectivity.