Originally Posted by kaosx
Question: I booked an LH flight to TLV before I got the new passport # and I can't remember if they asked for my passport number during the booking. The new passport has a new number, do I need to call LH to give them the new number or can I wait 'til day of the flight?
There is no problem to check in with a different passport, especially if the old one have expired ...

- there is no need to update them.