Unfortunately, airline miles cannot be transferred from one airline to another.
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You can join multiple member airline frequent flyer programmes if you wish, but they are each managed separately, so you cannot transfer miles or points between them or combine them into one. By using a single frequent flyer programme whenever you fly, you will reach Star Alliance Silver or Gold status faster.
As holder of an eligible Paid Lounge Membership, you have access to any Star Alliance member airline's Business Class Lounge* at the airport where your flight departs. Eligible paid memberships are United Club and Air Canada Maple Leaf Club – Worldwide.
Bid upgrades with Air Canada are a great alternative to fly comfortably at a lower cost, and it is offered by most airlines worldwide. Since Air Canada has a very good system with eUpgrades and it's very easy to earn points, I would prefer the more predictable options.
United AirlinesMileagePlus members who've achieved Premier Gold and above in United's elite status program receive Star Alliance Gold elite status. To earn United Premier Gold, you must earn 7,000 Premier Qualifying Points (PQPs), or you can take 16 Premier Qualifying Flights (PQFs) while earning 6,000 PQPs.
The closer to the flight departing, the less likely the airline is to sell a cash fare in the upgraded cabin. Thus, they may be open to the idea of offering it to an existing passenger for a discounted price. The prices vary depending on the airline and route.
Members of the Star Alliance include: Aegean Airlines, Air Canada, Air China, Air India, Air New Zealand, All Nippon Airways, Asiana Airlines, Austrian Airlines, Avianca, Brussels Airlines, Copa Airlines, Croatia Airlines, Egyptair, Ethiopian Airlines, Eva Air, Lot Polish Airlines, Lufthansa, Scandinavian Airlines, ...