I like how CO.com allows you to specify booking fare on the search page.
However, I cannot force CO.com to use Austrian Air on a GRZ-JFK trip so I need to use another booking engine.
Aside from calling a travel agent is there a online booking agent that I can specify 'V' or higher on Austrian Air to accrue 100% elite miles on CO? Or does UA.com have a place to specify specific fare class?

Want:
EWR-GRZ No problem getting booking fare class needed.

GRZ-VIE-JFK Problem as CO does not show Austrian Air and booking engines I have tried default to the lowest fare class which 'T'. No elite mileage accrual on Austrian Air 'T' fare.

Thanks for the help or other suggestions you may have.