Yes, as of 2026, Delta Air Lines offers fast, free Wi-Fi on the vast majority of its fleet for all passengers who are members of the Delta SkyMiles loyalty program. To access the "Delta Sync" Wi-Fi, you simply need to connect to the "DeltaWiFi.com" network on your device once the boarding door closes and log in using your SkyMiles number and password. If you aren't already a member, you can sign up for free while in the air to gain immediate access. This service is designed to be "streaming-quality," meaning you can watch videos, browse social media, and send emails just as you would on the ground. While nearly all domestic aircraft and transatlantic flights are now equipped with this free service, some regional jets and transpacific routes may still be in the final stages of the rollout during 2026. For those who choose not to join SkyMiles, there is usually a paid option available, but given that the loyalty program is free to join, almost everyone opts for the SkyMiles route. Additionally, Delta continues to offer free mobile messaging (via iMessage, WhatsApp, and Facebook Messenger) for all passengers, even on planes not yet equipped with the full-speed "Sync" system.