In-flight entertainment (IFE) and WiFi Internet connectivity options on US airlines vary widely. Old aircraft of many legacy carriers and even new aircraft of most low-cost carriers do not even offer personal display screens.
Virgin America and JetBlue offer some of the best IFE/Internet options among US airlines. Both airlines offer on-board WiFi and personal IFE displays with free and paid entertainment options including movies and music. Virgin even offers seat-to-seat messaging and on-demand menus through the IFE systems.
Read more about IFE & Wifi options on US airlines at PeterGreenberg.com:
The Best US Airlines for In-Flight Entertainment & Wi-Fi