After a LONG time away from trying Gears of War 4 again on Inconceivable mode due to having a very difficult time trying to take down the "Vulture" plane in Act II, Chapter 4, I finally wrecked that beast last night. If this battle goes well for you, it can be over in well under 10 minutes. For me there were several deaths trying to dodge the chopper's 3 waves of rockets prior to getting to the plane battle, and even more trying to dodge the 3 or so waves of incendiary bombs the plane drops.
Last time I tried playing on this mode, I got to the final part where you shoot out the turrets on the plane after blowing it's engines, but I died numerous times either while trying to destroy the plane's "core" from incendiary bombs dropping out, or from the ridges the pilot carved in the road with the plane's wings. This time I got through the final phase in one try after destroying the guns.
I also managed to take out the 3 Pouncers at the end of Act III Chapter 2 first try with just gun fire and roadie running from car to car when they pounced on top of cars close to me. I even survived a few stuns from being too close to a car they pounced on. So I've yet again fallen in love with this game and am currently at Act III Chapter 3 where you enter a museum and take on waves of Locust. I know I can do this part because I now retreat to the entrance area to use as a choke point for the final Juvie wave. I'm pretty confident if I can get through the Swarmak boss fight I'll be OK.
This is the closest thing I could find to how the Vulture fight went for me, except he died at the final phase and had to do the whole plane fight over again like I had to the prior time I'd tried it on Inconceivable.