Des Moines Airport Authority is scheduled to vote today whether to start charging fees for shuttles and commercial vehicles that drop passengers off at the terminal,The Des Moines Register reported. The airport is proposing to charge $1 per trip for off-site parking lot operators, 50 cents for taxis, $1 for hotel shuttles, $2 for limousines and $10 for charter buses. If approved, the fees would begin in April.