Originally Posted by
alanjed
I'm a newbie in this forum, so I may be all wet. But N13954 is flying SFO-NRT today as UA2788, and NRT-XMN as UA2764. It is my understanding (from a thread on Reddit) that United 27xx flight numbers are used for non-revenue repositioning/ferry flights. If so, I speculate something significant went wrong on N13954 which got patched up enough to be airworthy in FRA, and it's now heading to XMN for heavy maintenance. OTOH I may be dripping puddles on the floor. I still don't see N27957 or N24972 scheduled out of XMN.
Welcome to the forum! Something will definitely be leaving XMN as mentioned. You are also most likely right about N13954. Both the Frankfurt and Tokyo flights were non-rev so there could be some mechanical issues that will be addressed during heavy checks. Heavy checks are ran concurrently with Polaris retrofits.