FlightView and FlightAware are two companies that supply apps for tracking flights of all commercial airlines, including Delta Air Lines. Delta's Fly Delta mobile app offers a range of information, including flight status updates, but does not offer real-time flight tracking, as of May 2015.
A traveler can view information about FlightView's mobile flight tracker on the home page of FlightView.com, where she can follow a link under the heading Mobile Flight Tracker to download an Android or iPhone version of the app for free.
FlightAware offers flight-tracking apps for a range of operating systems and devices. From the FlightAware.com home page, a traveler hovers her cursor over Live Flight Tracking and selects Mobile Flight Tracker Apps from the menu to view and download the app for her device.
To download Delta Air Line's Fly Delta mobile app, a traveler can visit Delta.com and scroll to the foot of the home page to select Mobile Apps from the list under Connect With Us.