Why did it take just six weeks for a keelboat to float down the Mississippi to New Orleans but four months to make the return trip?

Ally just bought a plane ticket. she notices that the fare includes a september 11 security fee. what is the government’s purpose for imposing this fee? a. to pay for security at airports b. to pay for airplane maintenance c. to compensate airlines for rising fuel prices d. to pay for new government airplanes