They're not "worth" anything, beyond a tiny amount as scrap paper. Someone might be willing to pay a not utterly trivial amount for them as memorabilia, but likely not very much.
Planes can fly over enemy-held territory and shoot pictures of camps, weapons, and roads.
yes!
See the related link for some great pictures -
Two dollars
war planes
It is worth as much as a buyer is willing to pay for it!
In first world war people had planes that were mostly used for spying and taking pictures of the enemy maybe attacking but not heavy attack may be shooting.
With silver at $27.10 per ounce. War nickels are worth about $1.50.
There were 70 types of planes in ww1
Fighter planes and bombers.
yes see ebay
4