How tight is a 50 minute connection in FRA LH->TK?
We've booked a United ticket on two LH flight numbers, LHR-FRA-IST, with the second segment operated by TK.
It looks like LHR-FRA generally arrives into gates in 1A and FRA-IST generally departs from gates in 1B.
The inbound arrives at 1050; the outbound departs at 1140.
This is apparently a legal connection (UA suggested it and was happy to ticket it), but is it doable? If we misconnect, who rebooks us -- the ticketing carrier (UA), marketing carrier (LH), or operating carrier (TK)?