Quite surprised to see Vietnam Airlines opting for Gatwick over Heathrow - I assume it's down to slots. Airlines such as Avianca, TAAG, LAN and Aerolineas Argentias have all been rumoured to starting up Heathrow for ages I've always wondered where all the slots would come from? Are there any slots avaliable or are they accounted for? What happened to CSA's when they pulled out?