How do you beat the boss on the airplane quicker because I've hit him with..

You got to lure him to the end as close to the ledge as possible and then pull the leaver or push the box, its either one.

Most notably called the "Airplane Form," you will fight this bad boy
After the cut-scene upon getting on the Airplane with Steve. After
Trotting towards the cargo pit, you will find him. You will have to
Watch the switch very carefully which releases the crates to zoom
Forward.

Lure the Tyrant towards the end of the airplane, however, do NOT get
Hit. As if I had to tell you that. The Tyrant can knock you out of the
Plane like this, so one hit is a kill on his part, which doesn't favor
You very well, now does it? Weaken him with the B.O.W. Rounds from the
Grenade Launcher, Fire Rounds, and plain ol' regular Grenade Rounds.

He has a fierce way of attacking twice before you can even get up, much
Less run away, so don't let him get too close, and be sure to shoot him
No more than twice while standing in one spot.

Once he is weakened enough, run towards the front and flip the switch to
Release the cargo. If you do this well enough, the Tyrant will fly out
Of the airplane. If not, you will have to distract him until the switch
Lights up again for you to press it. The farther back he is, the easier
It will be to destroy him.

Also be sure and remember to heal frequently, too, as this will anger
You extremely to get close to defeating the Tyrant, and failing to do
So.