While Boeing has delayed the entry to service date of the 777X, they have continued to produce airframes at Everett with the result being a number of stored airframes on the field.  There are four jets in the test program and the rest are not going to fly until certification is close so, for now, they are finding spaces across the airport for them.  Some are on the Boeing flight test ramp (with production of the other widebodies ramping down, space is more available I guess) while others are on the cross runway.  This has been home to 787s and 737 Max jets over the years and now it is the turn of the 777X.  Some of them are identifiable by the paint on the folded wing tips while others are unmarked for now.