I should have said the OP could book international business class tickets, I have no knowledge of which airlines will or won't let you book first class in a three class cabin on international flights. I have only flown business class on an international flight once (on an A-330), and I thought it was more comfortable and luxurious than a domestic first class seat. Sorry for any confusion, I will edit my original posting.
Today is the last day to transfer MR points to Delta for the 50% transfer bonus. The actual transfer was instantaneous for me, but I previously signed up for the first time transfer bonus and it did take a little time to link the AMEX MR account to my Skymiles account.