Looks like "Adam" was correct.....GEICO is creative!
check link..
http://www.geicoskytypers.com/
WELCOME TO GEICO SKYTYPERS
The World famous GEICO Skytypers Air Show Team is a proud flight squadron of six vintage World War II airplanes that perform at air shows throughout the United States. They are the only existing World War II civilian squadron flying today, presently sponsored by GEICO Insurance. This unique flight team makes only a few select appearances every year in front of thousands of spectators. The six of eleven remaining vintage SNJ-2’s demonstrate low level precision flying as well as deliver aerial messages, known as Skytyping, 10,000 feet up in the air, as tall as the Empire State Building, and eight miles wide. The letters can be seen for 15 miles in any direction or nearly 400 square miles. Unlike skywriting, which utilizes a single airplane which takes approximately 3 seconds to form a letter.