Originally Posted by
flymexico2010
I do not know which type of certificate it is.
I received it when I volunteered on an overbooked flight....it is called electronic travel certificate for 500 $.
This is rather unusual for you to receive an e-certificate for volunteering your seat. Normally you receive $400 paper certificates (travel credit, type B) for a domestic flight.
E-cert can only be used online and you can apply it to anyone.