Delta expects to install its personalized Sync entertainment system on nearly all mainline, single-aisle aircraft by the end of the year.
The carrier has already enabled Sync on its Airbus A321 and Boeing 757 fleets.
Next up will be installations on Airbus A319s and A320s as well as the carrier's Boeing 737 planes by the end of the summer.
Sync offers flyers an experience similar to their own smart TVs. For example, the system remembers where flyers left on a movie or TV show from previous flights and keeps lists of passengers' favorite shows and movies. To use the feature, flyers log in using their SkyMiles account. It's free for SkyMiles members as an accompaniment to Delta's free WiFi.
Delta said that since enabling free WiFi last February, 39 million customers have logged more than 45 million streaming-quality sessions.