Problem combining AC with return on Continental
 

I would like to buy ticket SEA-YYZ-CPH-LED on Air Canada/SAS in economy class and return TLV-EWR-SEA on Continental in discount business class (Z).

I verified that Air Canada "S" fare SEA-LED and Continental Z fare TLV-SEA are perfectly combinable and called AC to book the ticket, since AC is the first transatlantic carrier.

It turned out that Air Canada does not see any discount CO fares in their system -- they can only book classes Y, B, D and A for CO flight, but not Z and not even any economy fare below B.

I would book my ticket on Expedia or Orbitz, but they do not allow combining economy outbound with business return.

Continental suggested a strange thing: buy economy roundtrip through Expedia, then call back CO and pay difference between whatever Y I got on the return and Z without any penalties, but it's a little scary. I think they did not realize that the ticket will belong to Air Canada and not sure how CO is going to modify it.

Any other suggestions? I am sure travel agent can do it manually, but calling a travel agent these days cost up to $100 extra + additional hassle if need to make any changes in the future.

Can you price it with ITA?

ITA can not combine Economy and Business, but if I try all economy ITA will price a nice "S" fare on Air Canada the outbound combined with nice "W" Continental fare on return. Air Canada call center can not do even this, because all they see for CO are "B" or "Y" fares.

Checking fare rules of the "Z" fare, it looks like it should perfectly combine with AC "S", just like ITA combined AC "S" with CO ecomony "W".

(you can probably coerce ITA to do it with /f bc=z on the CO part)

Take ITA's printout to any TA, and you should be successful at paying less than $100 when you point out that they don't have to do anything but type in 5 segments.