Typhoon ZJ915/BY holds the record as the longest hangar queen/spares source Typhoon in RAF service, although even that record looks likely to be broken with the way things are going. Delivered as an F2 in 2005, the aircraft flew with 29(R), the Typhoon OCU for several months before disappearing into 'storage' in 2006. The aircraft did not reappear for over four years, and sightings by non-RAF personnel during that time (which were rare, as the issue of Typhoons reduced to spares is kept concealed as much as possible) indicated that the aircraft had been completely cannibalized. By 2010 it had been rebuilt, but only for delivery back to BAe for the FGR4/block 5 upgrade from which it has now returned from and finally re-entered service. Since it's return it has been deployed on Operation Ellamy, which is why it is still fitted with the inboard pylons.