In 2019, the CEO of Delta stated that the airline planned to provide free high-speed Wi-Fi on all flights. Unfortunately, the pandemic threw a wrench in that effort.
However, the company has again announced that Wi-Fi will be available soon.
The airline is currently running trials on a few routes, but it aims to include Wi-Fi on every domestic flight shortly. An internal memo stated that Delta will expand free Wi-Fi to international routes by 2025.