Originally Posted by JoeDTW

41. (1987) With its acquisition of Republic Airlines, Northwest has an even larger presence in the Southeast. Its new hub in Memphis, Tennessee was never a hotbed of activity for widebody aircraft but Northwest has introduced MEM’s first 747 service along with DC-10 nonstops from four different U.S airports. With this question, we’re looking to identify those four airports. Are you up for it?
MSP and DTW have been correctly identified. The other two airports do not include BOS, LAX, MKE or PHX

TPA and MIA

Miami yes, Tampa no. Three down, one to go!

Bonus Question 42B: A total of twelve 747 flights into Miami were offered per the 1973 North American OAG employed to reference this question. Aside from Delta's seven flights, can you identify the airlines and origin airports of the other five flights?
(Hint:Less than 5 airlines and airports are involved)

NA to JFK and LAX, UA to PIT and CLE, and NW to ORD.

National is correct! NA operated two daily flights to JFK and one to LAX
Northwest is correct! NW operated a single daily flight to ORD

United is incorrect. UA operated no 747s into MIA in early 1973

So, four flights down and again, just one airline and destination to go!