Originally posted by AC*SE:
Two problems with e-ticketing:
1) E-tickets cannot interline, except with AC and UA.
2) E-tickets are limited to 4 segments.
If you have any other carrier, or more than four segments, the ticket must be reduced to paper.
I'm pretty sure E-tickets are not limited to 4 segments. I have issued plenty of E-tickets from UAL.com with over 4 segments. Up to 8 actually. Not sure what the rule is if you go to a CTO to ask a ticket to be issued electronically though, and I've never heard anyone have a e-ticket for RTW trips.