UN Visitors?

I made my semi-annual visit to JFK yesterday. I always see something new and exciting. I noticed a plane bearing the lettering "CESKA REPUBLIKA". The tail had the numerals 2801 but I saw no reg. #. Was this a VIP flight from the Czech Republic? I also saw another small aircraft bearing the lettering "South African Air Force". These were all taxying by T1 around 1400. Finally, I noticed, which I posted elsewhere, a Caribbean Airlines aircraft, 9Y-TJR bearing a strange livery with a "t" on the tail within a bulls-eye; no hummingbird.

Both VIPs for UNGA. The 9Y hybrid was already explained by Matt on that other thread...