Fly Delta is the iPhone app created by Delta Air Lines to get you the basic information that you need during your flight. This is a great app that has come in handy every time that I fly on Delta.
The first option on the main menu of the app is the most useful option, the option to get information about your trips including your current trip. There is a direct link to get your boarding pass. A few months ago, I described how you can use your iPhone as a boarding pass by having an airline send you an e-mail with a link to a webpage containing an electronic boarding pass. It is every more handy to use the Fly Delta app because you don't have to find that old e-mail containing your boarding pass. Note that electronic boarding passes cannot be used at every airport yet. For a list of the 60+ airports that currently support Delta mobile boarding passes, look on this page. It includes all of the Delta hubs and lots of other airports. It is nice to not have to worry about a paper boarding pass, especially when you are away from home and don't have easy access to a printer. You can just launch the app when you are standing in the TSA security line and access your boarding pass in a few seconds, and then do the same thing when it is time to board the plane.
The app also gives you information about your flight status such as the departure and arrival times (both scheduled and estimated), gates, the type of airplane, flight time, distance, etc.
The app can also help you rebook a cancelled flight (or see if it was automatically rebooked). The app also includes a button to email your itinerary to someone and a button to create a calendar entry based on your itinerary.
When I am transferring planes in a Delta hub such as Atlanta, I find this app very useful. As soon as the plane lands, during the taxi to the gate, I can look up both my arrival gate and the gate for my connecting flight (and see whether that flight is delayed). If I want to eat or shop at the aiport, I then use the GateGuru app (my review is here) to see what restaurants and other businesses are at those two gates. It is nice to know whether your better restaurant options are at your arrival gate or at the next departure gate before you even get off the plane.
You cannot use the app to book a flight, but you can see flight schedules. You can also see the flight status of any flight, useful if you are picking someone else up at the airport.
Note that although you cannot use the Fly Delta app to book a flight, if you access delta.com on your iPhone you will be presented with an iPhone-formatted version of the website. The website has many more options, such as the ability to book a flight, but it does not work as well on an iPhone as the Fly Delta app. Thus, use the app when you can, but if you have to do something more complicated, access the Delta website in Safari. These next two images are from the Delta website, not the Fly Delta app:
The Fly Delta app has a cute and useful feature called Parking. Just tap the Parking button the main screen and you are given the option of taking a picture and writing a note to yourself with your GPS coordinates. That picture and your notes can help you to remember where you parked your car when you return home late at night after a long trip.
One nice feature is that you can often use this app even while you ar ein the air. If you are on a Delta flight with GoGo in-filght WiFi (my review is here), you can use the Fly Delta app and get updated flight information, even if you did not pay for the GoGo service. (You can also access the Delta website for free.)
When I started thinking about writing this review, I realized that there were two missing features that I would like to see in this app. Looking at the app description in the App Store, I see that Delta has already announced that both features are coming soon in the next release of this app. First, Delta says that you will be able to use the app to see a seat map and pick your seat. Second, you will be able to check your status on the upgrade or standby list. This will be great additions to the app. I suspect that Delta won't do this, but it would be really nice if the app would let you see a seat map even after you have already selected your seat. That way, as you are getting ready for your flight you could see how full the flight is and whether anyone has booked a ticket sitting next to you. I look forward to seeing how Delta implements this feature.
This is a free and useful app, so if you ever fly Delta, you'll want to get this one.
Click here to get Fly Delta (free): 
