The yield management curves airlines use are based on gross, not nett rates (i.e. they estimate demand based on what people pay for a ticket, not what the airline receives)
Given the short time period this is happening in, the rational thing to do is to keep the selling price constant (you've already set those selling prices at a level to fill the flights, reducing the price will only mean demand that you can't fulfil) It is just that the money the airline gets from selling seats has increased.
If this is permanent, yes, you may see airlines react by adding capacity and lowering prices. But not now.
So, Brett, do DL use QIK, or native greenscreen?