Originally Posted by
love_to_travel
What's interesting is that the agent said the ticket number I should use when rebooking is the old ticket number plus one.
Did you have more than four (4) segments on your itinerary? If so, you probably had a conjunctive ticket.
Each ticket only holds four (4) segments, so if you have more than four (4) segments, it continues onto the next ticket, which would be in sequence. The agent probably just read the last of the two (2) ticket numbers you were holding.