CO107, as an example, goes MUC-EWR-IAH. There is a plane change in EWR. I booked that routing, but could only choose my seat one time for CO 107. There are a few problems with that... 1) Two different plane types sometimes (in this case, both are marketed as 767-200 so might not be an issue; a little surprised they are flying the 762 on the international segment as Business First is subpar for international, if I recall) 2) Excludes me from complimentary upgrade on the EWR-IAH segment. Any workarounds, especially on item 2, from all you geniuses out there?