The Hubs and I are short 6000 miles for one international flight on CO using one of our CO One Pass miles combined with AmEx miles. Anyway to get that quickly?

I was reading about something called a Prestige Pass. Whats this? And how do I go about getting one?

Also, I was considering applying for one of cards where you earn instant miles.

Are those my two best options? Any clue which would be quicker about getting the miles.

Thanks!
Brenda