I'm planning on purchasing an iPad mini for use as an Electronic Flight Bag and I was wondering about OS support over the next few years. I bought an original iPad to try and be cheap about getting the app I need (which requires IOS 8), but was rudely awakened to the fact that IOS 6 is the maximum OS for that device. I've decided to try and get a used iPad mini (smaller size is better in the cockpit), and the sole purpose of this tablet will be the use of the aviation app I need in the cockpit. My primary concern at this point is making sure the tablet I buy will last me at least a few years before Apple decides to block it off from OS upgrades. So, since I don't know much about the timeline with IOS support, does anyone have any input on this subject? I can get a used iPad mini 1 for $150 on Amazon, but I guess I'll pay the $220 or so for a used iPad mini 2 if the original mini is going to be phased out in the next year or so. However, if I can save $70 on the tablet it'll really help with purchasing a few of the other things I need for my flight training. It's all about maximizing my limited budget. Thanks for any input!