I would like to use my M&M miles to book an one-way flight with United. I somehow assumed – since United is a Star Alliance member – that M&M miles would be compatible with Mileage Plus miles. But the Mileage Plus customer agent can only work with a Mileage Plus number.
– One-ways can’t be booked online via M&M, only on the phone (but not on weekends) – that’s why I tried calling Mileage Plus in the first place.
Could I transfer my M&M miles to Mileage Plus, say, within a day?