B-17D

First tier V US strategic bomber.
Has 2 options of bomb load - 8x 500 lbs bombs dropped in one drop with reload of 60 seconds, or 2 drops of 8 500 lbs bombs with reload of 80 seconds.
I've found bigger load better, because plane is slow and fragile to AA, so the less time spent within AA range, the better. Having 2 drops during pass over target allows to do more damage and score more points - with good approach it can single handed capture a plant.
With a good MM - tier IV/V battle with 5 caps it can reach Thunder or Doolittle medal.

So much pros, now cons.
Flown by bot is a HP piniata and free frag for anything with cannons - 2km altitude isn't stellar.
To be a harder target, it has to fly well over 2.5km - engines are handy. This altitude should cause most attacking planes to attack from the angle of bottom rear gunner (two barrels as an upgrade), which gives a chance to defend - as for now I used gunner trained in B-26 and an equipment extending the range in manual mode.
Flying lower we expose a dead zone at the level of wings - neither - upper nor lower rear gunner can fire to enemy attacking at that angle - usually bot Bf 110 or P-38. Bf 110 C-6 can kill B-17D from well beyond of gunners' range.
As for now I hadn't any battle with tier VI planes, but I suppose it won't be a challenge.

Very specialized plane highly dependent on MM and team to win, and map layout to score.