Originally Posted by iowatraveler
D/Z/I are all discounted business class inventory with various carriers, not just AA. Sorry for any confusion I may have caused.
Your post is as misleading as it is confusing. Yes, D/Z/I are discounted Business Class, but you make it seem like they're equivalent. Let me take you to school:
Deeply Discounted
Z = UA/Star Alliance
I = AA/One World
Z = CO/Sky Team
**Usually 50 day AP requirement
**Usually non refundable
**Not upgradeable
Discounted
D = UA/Star Alliance
D = AA/One World
D = CO/Sky Team
**Usually no or short AP requirement
**Usually refundable, sometimes small penalty
**Upgradeable
Full Fare
C = UA/Star Alliance
J = AA/One World
J = CO/Sky Team
**Typically no AP requirement
**Typically refundable flexible
**Upgradeable