In my experience, when BD did not issue a new ticket number when they needed to, checkmytrip.com showed the new flight changes as confirmed. Checkmytrip.com continued to show the old E-ticket number. About two days before the flight departure, the reservation was cancelled by the airline to be flown, due to lack of ticketing. This has happend to me more than once.

Has anyone flown tickets where they made date changes and checkmytrip never showed a second ticket number?