united airlines baggage tractors on the runway at dulles airport on a rainy day

transport highway road infrastructure lane vehicle asphalt walkway track racetrack freeway stadium tarmac bridge boardwalk overpass snow dulles international airport washington usa united airlines baggage tractor taxi rainy day tractors runway tug luggage taxiway faa federal aviation administration day lost truck travel luggage mover airplane plane aircraft airport jet aviation runway flight transportation air transport aeroplane fly flying passenger tarmac airline airlines investigation vehicle flight delay operations ntsb national transportation safety board cancellations canceled delayed delays travel disruption union work jetliner safety iad dc driving claim tractor