TSA waiver
A TSA waiver is a US Transportation Security Administration authorisation that lets a private or charter aircraft do something normally restricted: enter certain flight-restricted airspace such as the Washington DC area, land at Reagan National under the DASSP gateway programme, or carry foreign nationals on some international flights. Waivers require advance submission of crew and passenger details, and vetting can take several days. For travellers the practical effect is that flying privately into Washington DC, near a presidential visit or a major sporting event needs extra notice and paperwork, and a last-minute passenger change may not be possible.