Flight 916 originates in SEA, connects at IAD, and goes on to FRA. The A/C between SEA and IAD is either a 763 or a 752 (my flight on Friday states it should be a 763, but on 8/31 & 9/2 it was swapped for a 752 ).

Is the IAD-FRA segment always a 744? Or should it be the 763 that is used sometimes on the SEA-IAD segment? If it's normally the 744, any idea where that 763 heads off to after the SEA-IAD legs?

Just curious. Nothing too important here except for possibly doing another transcon in a 752.