Airline ticket reissue is switching the flight day of the booked ticket. a whole new ticket is issued for these kinds of changes, Consequently, a completely new PNR is issued for the new ticket. Colleen suggests: https://wisconsin.forums.rivals.com/threads/call-6531580287-for-exclusive-deals-%F0%9F%93%9E-30-off-on-discounted-business-and-first-class-tickets-in-singapore.35472/