There is just SO MUCH information. Airport diagrams, approach and departure plates (geo-referenced), all the different charts (sectionals, TACs, IFR hi and low, etc), checklists, radio frequencies, route planning, airspaces, weather, NOTAMs, TFRs, etc. I'm sure I'm leaving off tons of stuff. The flight planning features are fantastic.
ForeFlight is amazingly good and fully leveraged the power of the new iPad pros as well. Literally the best app. They also didn’t compromise by trying to do some kind of cross-platform attempt. It’s supremely optimized for iOS hardware. An electronic flight bag app that can perform just as well as the G1000 glass cockpit. Combined with the Stratus receiver, it’s even better because it gives you traffic and weather data in flight.
If there was ever a use case for not using some kind of pseudo-native framework in favor of real-native, this is it. Glass cockpit applications are the last place you want lowest common denominator code. It works great on even the iPad mini, but it really flies on the new iPad Pro.
Another cool feature is that you can use it with the X-Plane simulator. Amazing app and so inexpensive for what it does. The most expensive plan is $300 per year and the cheap plan is $99/year. I never fly without it.
As another commenter mentioned not true. There are various levels of commercial pilots. Not all commercial pilots fly for a large airline or shipping company.
Even though most commercial planes have a full avionics stack it usually isn't as good as for flight for most features.