Originally Posted by jlemon

57. (1998) From your home in Scottsdale, Arizona you need to travel to Montreal, Quebec for a symposium on light rail options and operations hosted by Bombardier, one of the world's largest companies in the rail vehicle and equipment manufacturing and servicing industry. With plenty of time available to you before the symposium, you decide to have a bit of fun with your flights out to Montreal. To wit, you’ve found a combination of flights that will allow you to.

• Fly between PHX and YMX aboard a 727, 737 and 747 in that order
• Both the 727 and 737 flights will be in all-economy configurations with only the 747 offering premium class seating
• The 727 and 737 flights are not variant specific

It’s worth noting that given the departure point of the 747 into YMX, one and only one routing meets the specifications outlined above, especially given the use of single class configured aircraft. BTW, you will overnight at the final connection point though this shouldn’t have any bearing on the parameters described above. Good luck, men!
The first segment has been identified as ATA PHX-MDW on a 727. The 747 into YMX comes out of Pittsburgh. So, all we need is the 737 operator between MDW and PIT. It wasn't Midway...

Perhaps the air carrier operating the flight from Chicago Midway to Pittsburgh was a small airline that was attempting to use MDW as a small hub at this time: Vanguard (which I believe began operations during the mid 1990's).

Allow me to quote a line often used by the late, great Ed McMahon on Johnny Carson's Late Show: "You are correct, Sir!! Har! Har! har!!! Here's the full itinerary:

American Trans Air TZ 751 Phoenix (PHX) 800a-1215p S Chicago (MDW) 727-200 X7
Vanguard Airlines NJ 804 Chicago (MDW) 400p-620p Pittsburgh (PIT) 737-200 Daily
British Airways BA 094 Pittsburgh (PIT) 645p-810p S Montreal (YMX) 747-200 Daily