Originally Posted by
oliver2002
M&M/LH uses the original coupon to reissue the ticket when processing an advance upgrade using evouchers/miles. So sometimes the LH etix system cannot find coupons with 016 (united) stock. But that problem is supposedly long solved.
Yes, codeshare don't have award inventory.
Have not tried it because of the lack of available eVouchers before year's end, but since the operating PNR now accepts seat-requests maybe that could be a route to get upgraded in advance on codeshares since that PNR contains the operating flight numbers and also has access to the ticket-data...
Greetings - Dirk