What is the registration number of the 10,000th Airbus?
The answer you are looking for is: 9V-SMF. 


Current registration number: 9V-SMF (source)

Let's try to add some related details.



Aircraft can have multiple ID during their life, at least a preliminary ID to be used by the manufacturer prior to delivery to the customer, and then at least a national registry ID.

Manufacturer pre-delivery ID

Airbus aircraft final assembly line for the A350 is in France at Blagnac, a small city near Toulouse, with parts coming from several countries. There are other final assembly lines, but none is for the A350.

The first test flights will therefore happen in France, well before delivery to the customer. The French registry delivers temporary IDs to Airbus, the same IDs being continuously reused on successive airframes. Airbus uses a lot of them.

In France temporary IDs start with letter W. This A350 has been registered F-WZFD until being delivered to Singapore Airlines:


The special 10,000th aircraft delivery logo on A350-900 MSN 54 with its temporary registration: F-WZFD (source)

This same number was previously used on other aircraft, e.g.this A350 c/n 9 and will be reused on next pre-production or pre-delivery aircraft.

Customer registration

Singapore Airlines then requested an ID which was delivered by the Singaporean registry. This ID is 9V-SMF:

This number was previously used for a B747 at Singapore Airlines.