Cgn, you are playing dirty! It´s unfair to pick just one dream flight....
Let me see...
I am not considering if certain airline operates with a certain aircraft (e.g.: varig doesn´t have L-1011s), range and flight autonomy.
Since I live in Porto Alegre (POA), I will start my flights with my home airport:
1st: POA-GRU-MUC (Munich) to visit a guy I met on Internet. He lives in Munich and his name is Kai... i love him very much
I would fly with Varig´s 747-400 all the way!
2nd: POA-GRU-LAX to visit my cousin and I would extend this trip to SAN to spot on a friend´s roof (I did that before and it was amazing) United Airlines 747-400
Kansai Airport must be huge! I would love to see it someday... Kai Tak (if it was still alive) would be a must-stop airport to take LOTS of pictures and enjoy some of the cool asian culture...
between KIX and HKG I would love to fly on a L-1011
I would love to visit London, Paris and make a stop in Barcelona, the city of my dreams... flights between LHR-CDG and BCN would be made with... Connie
Buenos Aires because it´s one of the coolest cities in South America. Santiago de Chile with a stop in Valle Nevado to SNOWBOARDING!!! Varig 737-700
New York, Chicago and Boston: do I need to say?
LAX and SAN: to spot
SFO: I always wanted to see San Francisco, but when I was in LA, we couldn´t go to SF cuz my parents wanted to see the San Diego Zoo... go figure...
6th- POA-GIG-LHR-MUC-KEF (Reykjavik)-LPA (Las Palmas)
This one I would go with Kai... He loves Iceland
Then we would go to Canary Islands because it´s a beautiful place
If I ever come with more dream trips, I´ll post them