There are already many daily flights. Here's a selection from just one of several agencies.

http://www.abc-charters.com/pages/flights.asp

Brian Williams did his NBC Nightly News from Havana this week, and marveled that he had actually flown there on AA. The NY Times also did a front page story on the size and scope of the US Interests Section, which is an Embassy in all but name.

With a couple of million Cubans in South Florida, it's likely scheduled services will predominantly be concentrated there, as they are now.