At the moment with all the aid staff flying out there it is very unlikely if there will be any cheap flights as all availability will be taken up to the effected areas. In the past airlines have made a packet from disasters, just look at how high airfaires to Kosovo were during the crisis there.

In time yes tourism will be important to build up the economies but remember flying BA, staying in the Sheraton and drinking imported beers will put virtually nothing back into the local economy. Try to stay in a local B&B and buy only local food and drink