An airport has been defined as a construction site where they land planes. That's always been true, but it's worse than ever today. Many overseas travelers will relate that their worst frustration involves getting in and around the airports. Delays plague almost every commercial carrier. Add to that the cumbersome and often unnecessary security measures bugging the traveler, which add hours to a scheduled flight.
Governments pay for airport construction, so it goes on interminably.
Airport road traffic is high. That's because the State offers free roads. Flights are delayed. The government runs the air traffic control system. Also, flights are not charged extra at peak-hours, which a free market system would do.