The Post’s Michael Bolden notes that National, Dulles, and BWI are beginning to see more delays and cancellations at this hour due to the snowy, icy conditions. A quick glance at the flight boards — Dulles, National, and BWI — shows that cancellations are scattered throughout. Certainly call your airline for specific, up-to-the-minute details if you have plans to leave the metropolitan region via plane this evening.