A large electrical outage at Reagan National Airport — the second such outage in the last nine days — is causing some problems with air traffic this afternoon. The Associated Press reports that power was lost in Terminals A and C, as well as the airports authority headquarters building, around 11:45 this morning. (We have heard that Terminal B was also without power; a call placed to the Washington Metropolitan Airports Authority to confirm has yet to be returned.) Power has reportedly been restored, but lines at security checkpoints are experiencing residual delays. Passengers heading to National this afternoon should also call their carriers and check for potential cancellations and delays. UPDATE: Officials are asking passengers to print their boarding passes at home if they can, but air traffic is currently normal according to an FAA spokeswoman who spoke to the Post.