it's clear that either the engine is still underway or it's not ready for mainstream consumption because, simply put, it'd be foolish to delay the game for the reason of adding planes alone and each plane, especially flyable, is a significant mountain of work.
It's not that clear. The main things to add seem to be features to the 3D engine and work on ships, campaigns, animations, and, of course, tests...
We already saw a lot of cockpit videos, and they are 2 or 3 years old.
