One thing I want changed is the selection of first class fares. When I select "First/Business", particuarly for domestic flights, the results almost always display A fares, which is discounted first class. This fare can be risky, especially in IRROPs, when sometimes people experience being rebooked in coach, without compensation for the difference (as A is actually a coach fare, but an instant upgrade).

DL should offer a choice for Discounted First Class (A) and true First Class (F). Less misleading, and DL can make money off of true F fares from customers. A true win-win.

My two cents.