My guess is that the C check is coming up sometime in January, so they are using it as a reserve until then. With the new 777 and 787 deliveries outpacing the now delayed retirement of the remaining 747's (PH-BFA to BFF already retired) they have the capacity now. The last C check was in early 2016?
Last edited by bankops; Jan 2, 2019 at 12:13 pm
Reason: D check to C check