The White House (or wherever a country ruler lives) is now part of a giant airship. 

Posted by FoundationSafe1255@reddit | CrazyIdeas | View on Reddit | 7 comments

The airship can fly up to wherever there is a big problem, so the ruler is closer to fixing it. If the country is invaded, it can be transported easily to an allies country. An armada of planes protects the aircraft. The dirigible balloon can be decorated with the country flag. If the ruler goes on tour, they can more easily meet people by moving the whole white house.