Originally Posted by
gusd
I was looking at award space for ORD-OTP on LH in I. EF shows no availability, even though united.com does. [...] For example, for December 12.
I can't answer your more general questions, but I can't replicate the specific problem you report. I've just searched that route for 12 December and seen availability (on LH, via FRA and MUC) showing on both united.com and EF. Maybe try again?