Originally Posted by Mwenenzi

That is probably unrealistic if travelling on cheapest economy tickets on a range of airlines, especially if flying a non USA based airline.

From post 2

A statement. A surprising number of people are not aware of earning/burning on FFP partner airlines.

Best if you get more details of the airlines flown and existing FFP's.
If upgrades are an objective put miles to the FFP where an upgrade is a possibility (flights marketed & operated by the airline).
Reward cost (miles) & reward co-pay fees vary between FFP's even in the same alliance