From the article linked: > Angered because the government was slow to make payments on his contracts, Lawrence fueled the plane and flew to Washington to strik

From the article linked: > Angered because the government was slow to make payments on his contracts, Lawrence fueled the plane and flew to Washington to strike a telling blow against the bureaucracy. Circling the Capitol at ground level to disrupt Congress, he landed directly on the Capitol steps and stormed into the office of the Assistant Secretary of the Navy. I'm gonna guess this is when they started writing up some restrictions re: landing on the Capitol steps.