Local airport managers are concerned about the impact potential new user fees could have on the general aviation industry. Pella Municipal Airport Manager Shane Vande Voort says this would create a cumbersome bureaucracy that would force aviation costs skyward. Dan Van Donselaar is manager of the Knoxville Municipal Airport. He says the possibility of raising fees for passengers to check their flights, or charging landing or ramp fees would hurt local aviation more than larger metropolitan airports.