All plane types are included that were historically present, including seaplanes. Switching a squadron to a new plane type drastically decreases their exp level. Planes may be shot down or take various amounts of damage, affecting their repair time. This damage can be caused by Air strikes or shore bombardment. For enemy bases you are given estimates of the above based on your intelligence of the base.
Supplies arrive daily at Fiji, and have to be shipped to the forward bases.
Any new Transports purchased also come loaded with troops and supplies. Armies are considered infantry, mechanized or armored based on the percentage of supplies included in the army. VP's are earned for sinking ships and occupying operational bases. Well I hope this helps. There is even more to the game than I've gone into here, but this is already longer than I intended.