Waiting for a Haircut
Air traffic controllers, passengers, and the LAX airport all shared one thing in 1993: their displeasure with President Clinton for causing several flight delays. The President sat on the runway getting his hair trimmed, forcing controllers to make a split-second decision.
Source: Wikimedia
Air traffic controllers hurried to ensure that no other planes came in or out during his haircut, causing a massive snarl-up. However, the President of the United States must look nice and arrive in elegance. We just believe he could have done so once the plane was securely in the air.