Status update on N664US
The aircraft is still at RKSI, Delta purchased the two former Singapore Airlines Cargo 747-412BCFs. 9V-SCA/B last year, and have continued to store both aircraft at Victorville, CA (SQC already had them there). Both frames are used as spare part donors for DLs 747-451 fleet.
Various parts (mainly wing panels) have been taken from -SCA/B the past few days and are being shipped to RKSI in order to make N664US fit for a ferry, unclear at this point if it will be to KMSP for return to service work or to KMHV to be immediately retired. All PW4056s have been boroscoped and were reported undamaged.
One of the previously three stored -451s at KMHV, N671US was ferried to KMSP a few days back to be immediately prepared for return to service. All three aircraft were stored in such a manner to be returned to service within a few days if necessary, great fleet/contingency planning.
These three frames were stored last year as Delta has begun to slowly retire the once 16 strong B744 fleet, the first three were chosen based off their vicinity to the next heavy maintenance checks.