So I think we all know how good the original Flight Tracker app for iOS was. Sadly its been replaced by a bloated impostor that is full of useless info like all the codeshares and makes it difficult to see what plane the flight will be operated with etc. MyFlights is also no longer ;-( which I fear is irreplaceable. I feel 2017/2018 have seen a significant downgrade in terms of travel apps. I am now using:

Flightradar24 to search for flights on specific routes
Tripit to keep things organised (but the interface has much to be desired)
Flight Tracker to search/track flights but it is not by any means ideal.

So FlyerTalk what apps are you using in 2018?