Star Alliance - What is "executive", lounge wise?

I have booked my first award flight (yay!) Calgary-London-Vienna (Air Canada/Austrian Airlines), the question is -- can I access the First lounges at LHR or only the business ones with a ticket that says "executive"? Does this matter, even? The 77W is two-class service so there is not much guidance. I do not have any status.

Also, which lounge do you recommend? I land at Terminal 3 and leave from Terminal 1.

I have booked my first award flight (yay!) Calgary-London-Vienna (Air Canada/Austrian Airlines), the question is -- can I access the First lounges at LHR or only the business ones with a ticket that says "executive"? Does this matter, even? The 77W is two-class service so there is not much guidance. I do not have any status.

Also, which lounge do you recommend? I land at Terminal 3 and leave from Terminal 1.

A neither of the Airlines has First Class you cannot use a First Class Lounge. So its MLL at YYC and *A Business Lounge at T1 -LHR. Shortly the BMI Lounges in T1 will have become OW/BA.

Do not miss the AC Arrivals lounge in LHR T3. It is open am only, and has showers, Internet, papers, and epic breakfasts!

Do not miss the AC Arrivals lounge in LHR T3. It is open am only, and has showers, Internet, papers, and epic breakfasts!

I think porridge is only available before 10 (or maybe 11?) though. Of course, it's still a good place to indulge in an extremely unhealthy bacon butty. :D