Looking at the Raderbox there are currently a few aircraft testing the skies.
BAW9156 GCIVC over South Wales at 30000ft
HLX2262 DATUK 738 EDDF-LEMH at 38000ft
HLX113 DAHFI 738 over Holland at 41000ft
TUIFLY111 738 DAHFP over Northern France at 41000ft
AFR383S 773 FGQSD Heading toward Paris at 24000ft
DCALM is also up again in the UK