AA has issued a Japan waiver
Here's the info:
Japan Travel Policy
Due to the earthquake that has impacted Japan, American Airlines will offer its customers the convenience to change their travel plans as listed below.
If you are traveling to/from/through: Tokyo, Japan Haneda (HND)
Tokyo, Japan Narita (NRT)
On the following dates: March 11-14, 2011
And your ticket was issued no later than: March 11, 2011
You may begin travel as late as: March 18, 2011
Original inventory required? No
The ticket reissue charge will be waived for one ticket change.
To change travel dates or for questions regarding refunds or destination changes, contact our Reservations personnel at 1-800-433-7300 within the United States or Canada. If you are calling from outside the United States or Canada, please check our Worldwide Reservations Numbers page.