Chateau has presented his educated guesses about where in extended Europe AR19 will depart from:
Madrid
Dubai
Tel Aviv
Odessa
Istanbul
Kuwait
Amman
Damascus
Riyadh
Doha
Beirut
Jeddah
Muscat
Baku
I have different educated guesses, which I base on an analysis of East Coast (plus Atlanta) airports. I did an exhaustive but not absolutely comprehensive search of all flights (except a few where I could not read my handwriting) from extended Europe nonstop to Boston, New York JFK, Newark, Philadelphia, Washington IAD, Charlotte, Atlanta, Orlando and Miami airports since it was only on all flights today. Here is that analysis:
Boston - Munich, CDG, Munich, Frankfurt, LHR, Amsterdam, Zurich
JFK - AMS, Tel Aviv, Luxembourg, FRA, CDG, Liege(?), LHR, Helsinki, Madrid, Moscow, Brussels, Keflavik, ZRH, Dublin, Valencia, Milan, Nice, Vienna, Madrid, Manchester, Stockholm, Munich, Geneva, Athens, Budapest, Rome, Amman, Istanbul, Venice, Copenhagen, Pisa, Shannon, Barcelona
EWR - LHR, Keflavik, FRA, TLV, Copenhagen, Shannon, Dublin, Glasgow, AMS, Cologne, Berlin, Stockholm, Edinburgh, Brussels, Geneva, Manchester, CDG, Paris-Orly, Munich, Stuttgart, Milan, Barcelona, Madrid, Lisbon, Athens, Warsaw
PHL - LHR, TLV, Lisbon, Manchester, Dublin, Glasgow, Frankfurt, CDG, ZRH, Venice, Munich, Rome, Athens
IAD - LHR, MAD, Vienna, Brussels, Vienna, AMS, CDG, Rome, ZRH, Manchester, CDG
CLT - Dublin, MAD, CDG, FRA, Munich
ATL - Athens, Leipzig (?), AMS, Dusseldorf, FRA, Barcelona, MAD, Munich Stuttgart, Milan, Moscow, Dublin, Rome, Venice, CDG, LHR
MCO - AMS, Dublin, Edinburgh, FRA, Glasgow, London-Gatwick, MAD, Manchester, CDG
MIA - Budapest, MAD, Venice, Milan
So, what does all this mean, as it could be any one of the above 37 extended European departure points (or it could be a connecting-in-the-US flight which would destroy my logic)? I happen to like the places where past Amazing Race seasons have bypassed. The most prominent of those are Munich, Dusseldorf, Brussels, Madrid or Copenhagen, since I exclude Glasgow, Edinburgh and Manchester for being off the continent proper, Valencia for having only 1 flight and Leipzig and Liege for having 1 weird flight each. I think it could be any of the most prominent 5. We'll see.