Originally Posted by YVR Cockroach

41. (1979) After a week of studying archeological artifacts recently discovered in Mexico City’s Chapultepec Park, it’s time to return home to your work in the Department of Anthropology at the Université de Montréal. Iberia offers a nonstop flight but it’s sold out all week. Thankfully your Québécois tinged Spanish is good enough to have netted you a newly expired OAG from the travel agency located downstairs in your hotel lobby. A thorough perusal of its pages allows you to cobble together an exciting three flight routing up to Montreal involving three different airlines operating three different aircraft types, each built by a different manufacturer. Each of the airlines is also its country’s main flag carrier. As an added bonus, you can complete the entire trip in a single day. Identify the three airlines, the aircraft type each flies and the routing of this trip. Buena suerte!

Wild guess on 41.

MIA-JFK Aerolinease Argentinas 742
JFK-YMX British Airways L-1011

That is... seriously wild, YVR. The main issue is in the AR flight which would not be allowed on its own due to the segment being totally within the US. The only way you could fly MIA-JFK on that flight would be if you had started out of Argentina and stopped over in MIA before continuing on to JFK - i.e. CONDITIONAL STOPOVER TRAFFIC

As to BA up to YMX - there were no BA flights operating this segment in 1979. I will say that no Lockheed products were involved in this itinerary.

Now then - the night is young. Please, do guess again!