https://www.airforcemag.com/air-force-announces-it-will-buy-e-7a-wedgetails-to-replace-awacs/
>Air Force officials have previously said the Northrop Grumman E-2C Hawkeye and the Saab Erieye, both turboprop-powered AWACS-type aircraft, lack the speed, altitude, and capability USAF needs for the mission.