Interesting day in the CIs. E-4B 75-0125 Brussels to Andrews AFB flew right over me FL310, not a cloud in the sky, not trailing - could not see it. 166696 C40 Bergen to Rota - saw that one, together with G-XLEF FL410 Madrid into Heathrow (got some nice photos) , & OO-TMA B738max taking an unusual route to the Canaries out of Brussels.