Flight crew will take the bird for a spin without pax in LEJ, they can't fly with pax till the check flight has been done. Cabin crew will not train on live flights.
If you are SEN (or know one who will lend you the miles from his/her account) you can get the IAD inaugural by WL an award, which should clear because D is still available for sale. Awards to/from Europe to IAD are currently 55k miles, so this would be a steal (if you ign
re the 600-700$ in taxes and fuel surcharges)