The simple answer to OP's question is that this is what AA's RM algorithm is recommending. AA believes that demand will support the higher prices, e.g. customers will pay what is being sought.

That algorithm is predictive, but based on many factors and is right much more often than it is wrong.

If the fares are raised and AA can't sell the seats, it is far better for AA to once in a blue moon lower its prices, than to sell seats for less than it could have.