Now it makes more sense.
Leg 6 JFK - Milan Malpensa (MXP?) on an Alitalia 747 Combi
Leg 7 Milan Linate (LIN?) to Paris Charles De Gaulle (CDG) on an Air France A300.
Leg 8 Paris Orly (ORY) to London Gatwick (LGW) on Sierra Leone 707 (5th freedom carrier)
Seeing that Allegheny did not fly BWI-EWR, I will assume LGA, however I see 4 airlines flew BWI-LGA, but two of them operated jets. I will leave the rest of this alone.