The phrase
"most airline partners" means that an airline has established relationships and agreements with a large number of other airlines to provide services, such as shared flights or frequent flyer programs.
Full definition
You can transfer at a 1:1 ratio to
most airline partners, but make sure you check before transferring (since SPG transfers to some partners at a much poorer rate).
For example, American Express Membership Rewards transfer at a 1:1 ratio for
most airline partners.
Put simply, 20,000 Starpoints equals 25,000 frequent flyer miles — oh, and they have
the most airline partners of any credit card issuer, including some carriers that require very few miles to go long distances.
Most airline partners are at a 1:1 transfer ratio.
As you can see,
most airline partners can deliver good value if the price of a ticket is relatively high.
Starpoints are great because 1) Has
the most airline partners of any flexible currency by far at a 1:1.25 ratio, 2) Partners with Alaska, which has the best award chart (especially for flying on Cathay / JAL F), 3) Great Nights & Flights redemption options.
Although Starwood Preferred Guest has
the most airline partners, transfers take place in batches based on the day of the week you request them, and can take up to 14 days to post.