TB as for your thought that Michael would have flown from Miami in a newly minted passenger jet....I lived in the Miami area when they were introduced, and for about the first year of commercial jet travel the only Jet flights out of Miami were to New York and Chicago. San Juan was added in '59, and the rest followed. It is possible he took a jet to Chicago, but from there he would have had to take a prop plane to Vagas, with a couple of stops IMHO .
That's what I was thinking, dt. The Boeing 707 was introduced into service in '58, but, logically, jets would have flown only on the highest volume routes initially--and Vegas in '58 wouldn't have been one of them. That's why I guessed it'd have taken Michael about 48 hours total to get from Havana to Vegas.
This raises another question: If Michael was in such a big hurry to leave Tahoe after the shooting ("If what I think has happened, has happened, I leave tonight..."), why did he take a train to Miami? I doubt a passenger train stopped at Tahoe in late '58--he'd have to have gone from Tahoe to maybe Reno or Vegas to catch a train. If he had to do that, why wouldn't he fly? And, on a long train trip, he'd be more vulnerable to unknown assassins than on flights. A guess: FFC wanted to set up that dramatically lit shot that introduced us to his bodyguard.
