Some items that I saw on ADS-B Exchange in the UK at lunch (can't get on the Chans at work).
2-NOVA - Beech B66 Baron - sneaking along the South coast of the UK from Taunton, Somerset to New Romney, Kent at 3500ft. Kept dpping in and out of ADS-B due to height. 2-NOVA is owned by Novatrust Agency SRL of Romania and Switzerland, among others.
2-ANLD - Pipe Seneca - privately owner, not much data on it.
SNPSHOT01 - RAF Bombardier Global Express Sentinel, flying patterns around Bristol Bath and the Avon estuary.
In the US, Nightwatch ABIDE99 was over Oklahoma, with Poseidon 168996 over Texas (no call sign).