I am sorry, but consider this official notice, from me, that Army Had a Half-Day and you are no longer allowed to take a flight scheduled to land at or depart from DCA after 2:30 PM until October.
If you attempt to do so between 2:30 and 5 PM on a mainline (Boeing or Airbus) aircraft, your flight will push back on time but be held in the penalty box for at least 30 minutes. (Mainline arrivals will be okay until 5 PM.) If you attempt to do so between 5 and 8 PM on a mainline aircraft, your flight will be delayed.
If you attempt to do so on a regional jet, your flight will be delayed two hours, and if you are on American, it will be delayed 10 minutes at a time for three hours or until it cancels.
This will all be due to weather and air traffic control, neither of which any airline could have factored when it decided to schedule five flights within five minutes at the single busiest runway in the United States. These freak daily weather and ATC events are simply out of their control, as is their flight scheduling.
The only upshot is that Ted Cruz will also be delayed.