Somewhat Amusing
 

From the TWA website:

"If your flight has been cancelled, TWA can reissue your ticket for the next available TWA flight. Change fees will be waived."

Mighty nice of them to waive the fees. OTOH what a potential revenue source: "We're sorry your flight was cancelled, but I can rebook you on the next flight leaving 5 hours from now, but I need to collect the $100 change fee..."

The change fee is for voluntary changes. Charging a change fee for a flight cancellation violates the Contract of Carriage, in addition to being a stupid move on the airline's part.