I think you should avoid "dead aviators" type questions, and make
the questions more relavent to your local area. And even though it
is a contest with some sort of prize, the primary goal should be to get
all the radio lisenters interested in the material. For example:

How many public-use airports are there in Iowa?
In what year did the Iowa City airport first open?
What type of aircraft was the first to land at the Iowa City airport?
How many aircraft are based at the Iowa City airport?
How many air (nautical) miles from Iowa City to First Flight Airport
at Kittyhawk?

Check into the history of your airport and find out if you have had
any famous visitors or interesting local aviation characters.

You could also use the questions to teach them a thing or two about
general aviation:

Why do aircraft pilots use nautical miles to measure distance?

Name three current manufacturers of general aviation aircraft.
(you could have lots of fun with variations: "Which of the following
companies does not build aircraft: Piper, Maule, Cirrus, Winchester")

Name the categories of aircraft defined by the FAA. (I would be that
even most pilots would leave out the recently-added "powered lift"
category)



Happy landings,
Ross Oliver