Sorry you are right, I remember hearing a story from one person who went to cuba via another country, and in Cuba customs did not stamp his passport so that no one would know that they had gone Cuba. Very Interesting.
Regarding another company buying Boeings for CUBANA, no they could not do that, because any company that does business with Cuba A) Can no longer do business in the US, and B) the companies CEO and their family are barred from entering the US. This was a big issue in Canada about two years ago, I think that since then those rules have been lightened, but they are still outrageous, who is the US to tell my company who I can and Can;t do business with!
"Clive Beddoe says he favours competition, but his actions do not support that idea." Robert Milton - CEO Air Canada