You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: ANCIENT HISTORY 
Clue: Circled 7 times by the Israelites in Joshua, it's said to be the world's oldest walled city
jericho

Category: BUSINESS 
Clue: On April 17, 1973 this company began operations with the launch of 14 small aircraft from Memphis International Airport
federal express

Category: THE DOW JONES INDUSTRIAL AVERAGE 
Clue: Of the 30 corporations that make up the Dow Jones index, it's the only one that began as an entertainment company

disney