Originally Posted by demue

What's the connection time between the options shown on airline specific search?

If over ~4hrs or so, even if the segments have availability, it'll error out. My experience and suspicion is that longer connection times cause the problems and that they get filtered out via Smartsearch. A working theory, but it has proven correct (for TG at least) every time I tried meaning when I chose a shorter (if available) connection it worked and no E2.1. it's silly, but it's LM after all. YMMV