Currently you can't use an e-ticket to connect with a flight on a different carrier, because the airlines' computers cannot communicate with each other.

FORBES: Fact and Comment

Half the 45, 000 daily Shuttle passengers use an E-ticket already.

FORBES: Teaching an airline to fly

If you hold an e-ticket and your flight is delayed or canceled, you must redeem the e-ticket for a paper ticket to switch to another carrier.

FORBES: Fact and Comment

This was not as easy as I had hoped, fiddling between credit card and phone with freezing cold fingers, but, by the time I got on the intercity to Geneva I had an e-ticket and I proudly showed it to the conductor.

BBC: Swiss love affair with rail turns sour

Equipped with what was left of the tickets, pictures of the originals and an e-mail verification of his purchase, he called Augusta's ticket office on Monday morning in hopes they'd be "gracious Southern folks" and let him and his friends attend the event.

CNN: 'Hungry dog' eats, vomits up treasured Masters tickets