Let's summaries the teams that we know of, you may correct me or add other info:
Older couple – seen at Switzerland and Austria (photo evidence, last sighting)
Girls in their 20's – seen at Austria (photo evidence), Romania and Thailand ,Phuket (photo evidence, last sighting)
Couple in Orange, woman is deaf – seen at Switzerland (photo evidence) and Thailand, Bangkok connecting to Phucket (last sighting)
Male little people – seen at Romania and at Thailand, Bangkok connecting to Phucket (last sighting)
Sister's in Green (Kelly Ripa lookalike???) – seen at Switzerland, Romania and at a Beijing to Tokyo flight (last sighting)
Father and son - seen at Thailand, Bangkok connecting to Phucket (last sighting)
African American women – seen at Switzerland and Romania (last sighting)
Asian couple – seen at Romania (last sighting)
Older men - seen at Thailand, Bangkok connecting to Phucket (last sighting) , could be the father or little people teams.
Evidence of couples – Very vague and could be the Orange or Asian couple- Switzerland (pretty tall women) , Austria.