The reality is that short of creative leasing agreements with neutral or Castro-friendly nations such as Venezuela, or companies such as TACA, Cubana is in a straight-jacket since their former Soviet aircraft suppliers cannot meet its needs or, put more precisely, its potential.
With American Eagle and other US carriers flying to multiple Cuban destinations on a daily basis, there is a surreal aspect to the situation currently. It is in Cubana's interest that relations somehow normalize someday soon, with vision and rational thinking on both sides.
Boeing and/or Airbus equipment would probably appear on Cubana flightlines within five minutes or so of normalization of relations, although either might insist upon cash in advance from the Cuban government if Cubana remains state controlled following the transition that normalization might bring.
The Pan Am-founded Cubana de Aviacion could really benefit from a rational Boeing fleet mix of 767-757-737 aircraft, or Airbus 330-320 family aircraft, and, certainly, Bombardier or Embraer RJ
and turboprops for local services. I suspect that the success enjoyed by hard working Cubans in Florida free to achieve their potential can be acheived by Cubana personnel free to compete and win business with their traditional warmth and hospitality.
Meanwhile, everyone loses, especially Cubana, so close but so far from passengers in Miami and New York, where they once flew very competitively with Lockheed Constellations, no less.