Feature request for alerts

I've just paid up for the app and the in-app purchases on my iPad, and get good use out of the app.

The ability to do push alerts is very exciting, and I quikcly found one type of alert that would be exciting to have:

- Alert when a given flightnr is *not* flown by a specified equipment type. This is ideal for spottinger and nerds enjoying to get to look at unusual types on routes that normally gets flown by the same type 99% of the time.

Thanks for a great app! :)

-A