How many airplanes do you have? I have 6 and they are all Turbine Jets. Each of them has one. 6 jets, call it $5,000 a jet, even though they are more like $8, and then 6 times 60 is a measley 360 clams.

Ya, they are are worth it

For a prop plane, you could get away with what we used to do in Ducted Fan, which is basically a four ounce tank plumbed the way a normal tank is. Just plumb it between the main tank and the engine. That way the engine is always drawing from a full tank. The clunk will never be suspended in air.

FWIW.