We're often in Moline, and always fly in and out of the Moline airport to get to Orlando. It's a *great* little airport. I don't know the exact mileage to the John Deere thing - I'm sure you could get that on mapquest - but it's certainly not far.
AirTran flies in/out of Moline quite a few times daily, routing through Atlanta. Don't know if that would work for you. Other major carriers are American, United, Delta (I think) and Northwest.
No way I'd do anything other than the Moline airport, unless the flights into Moline were ridiculously expensive &/or highly inconvenient time-wise.
debg