Originally Posted by
WheelsFirst
The SPG and Amex Plat cover basically every international carrier except United. If you want United and want to put a lot of spend on a card, the United Club card gives 1.5 miles per dollar spent, that's probably the ticket.
I'll slightly refine that. Starpoints and Membership Rewards points both transfer to Air Canada Aeroplan 1:1, which should give the member the ability to book a ticket on any *Alliance airline, including United.