Determining this is one of the joys of being in the sales team for any large-scale product, and is a skill that both Boeing and Airbus will be leaders in. Believe you me, both manufacturers get many approaches more potentially wasting of their time than Ryanair !
Correct which is why I said last year that Airbus Exec who gets FR's business is set up for life with bonuses.
Despite the public statements no manufacturer will turn their back of a 200 plane order irrespective of what they think of the purchaser.