These questions are about Business Class travel.

1) What is the difference between C, D and Z classes?

2) A rather ill young lady from Bombay (Mumbai, India) needs to come to the United States. Given her health, she needs to fly Business class, which she can barely afford. What is the cheapest U.S. airport to fly into from Bombay?

3) I will be performing complicated surgical procedures on her free of charge. Her return date depends on the outcome of the surgeries and her recovery, so is uncertain. She may have to stay here anywhere from 4 months to a year. From what I understand, her initial visa will be issued for six months max but can be extended. What is the best business class ticket for her to buy moneywise and from the visa point of view (i.e. non-refundable but extendable, fully changeable, etc).

Thanx