Here's what it sounds like when you fly too close to the president

Whenever the president is in town, a restricted airspace is set up in the area. Often times, pilots of smaller planes don't check the current restrictions and end up inadvertently entering the restricted space. The US Air Force tracks all these planes, and will come up on the aviation emergency channel 121.5 MHz (known as 'VHF Guard') to warn them away from, or out of, the area. Quite a few planes have wandered into the airspace this afternoon. Here's a recording of the radio transmissions of them getting 'yelled at' by the Air Force:

TRF violators by AlertNewEngland