BEN!!! Welcome back!
We missed you!
Here's a rundown of a few of the iPhone flying apps:
Weather+
What I've mainly done for weather is to put icons for my most-used weather web pages on my home screen:
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ForeFlight ($75) - This has the A/FD, approach plates, and does weather (and files flight plans - If you have this, it basically has the ForeFlight File app built in). Cool, but at the price I haven't been able to justify it as most of my sources for such things are free, except the actual A/FD and IAP books themselves. (Part of the reason for the high price is that their data updates are free.)
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AeroWeather - FREE. Very well done, but only does METAR/TAF type of stuff. However, it lets you put in multiple stations, will build a list of all the nearby airports so you can easily select new ones, and lets you easily tap to see an airport in Google Maps or Airnav, or get a listing of other nearby airports with weather.
Logbook
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LogTen Mobile, which Nick mentioned - I think you probably want
LogTen Pro on the Mac to go along with this, I'm not sure if the mobile version is truly standalone. The Mac version is a SWEET logbook app. (I have the Mac version, but not the iPhone version yet.)
Flight Planning
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CoPilot - $20. This one was apparently around for years on Palm OS, but it's pretty well-done for the iPhone. I haven't set it up fully (as you can see by the missing fuel/time data below) but it appears to at least attempt to be pretty accurate. It also lets you calculate weight and balance, true airspeed, winds aloft, etc.
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ForeFlight File - A simple $5 flight plan filing app. Works very well - it even tells you whether or not the plan was filed, and if it fails will help you correct it. It also lets you pick the airplane colors as COLORS with real names, rather than trying to remember that "W/B/GD" is what you need.
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PilotWizz (free) - E6B type calculations, weight and balance, holding pattern calculator (not just entry, but also shows what the pattern will look like with wind), etc.
Flight Simulator
* X-Plane ($10). This comes in four versions:
X-Plane (which is GA-focused and has the Cirrus SJ50 Vision jet, Piaggio Avanti, King Air, Piper Malibu, Columbiessna "Corvalis" 400, and Cessna 172),
X-Plane Airliner (737, 747, 777, 787, A-380, MD-80),
X-Plane Helicopter (R-22, Jet Ranger, Blackhawk, Sea King), and
X-Plane Extreme (F-22, B-1, B-2, and SR-71). Each is $9.99. I only have X-Plane, but it's all the fun I need on my iPhone.
Test Prep
* There are FAA Test Prep programs for
Private,
Commercial, and other ratings.
Other
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ForeFlight Checklist ($15) - Airplane checklists, on your phone. Cool. (I don't have this one yet, but judging by their other software it's probably well done.)