DF,
Not a 787, but an Airbus 321. Carries a little over 1/2 gallon and will fly for about 9 minutes.
They make WWI planes, they are more difficult to fly than the more "modern" aircraft, but the governing body which provides insurance for liabilities (AMA) prevents you from putting anything like a real gun or missile on a plane like this. They do however make some laser systems where you can dogfight, but as a cheaper variant we sometimes tie a crepe paper streamer to them and chase one another trying to cut the other's tail. Harder than it sounds.....
Look forward to meeting some of you.