Hi, all airlines offering flights to Cuba, must, by law, also offer you a chance to buy the visa. There are usually terminals at the airport which will sell you the visas, or the airlines themselves will sell the visas at the check in gate.
The catch is that if you call the airlines you will be put in contact with a customer service rep who is usually totally lost and has no idea about any of this.
My best advice would be to go to the airport and ask at the counter where yoi can buy the visas. Then ask what the price is.
But I warn you, the airline companies are getting away with charging an arm and a leg for the visas because they know the competition is low. So AA might actually charge you more than CTS.
I dont know all the prices, but in general for an america to Cuba visa, most airlines charge around 70 to 80$. And some as much as 120$. Crazy.
Good luck
