Rerouting question
Hi All! Planing go to IAD on july 3 from Kiev, Ukraine on LH via FRA. I have special economy fare $723(not bad for just booked isn`t it?) which have in restrictions that trans atlantic travel should be on LH only(just fare rule) on ticket valid on LH/OS/UA/SK only, so i can`t book UA 977 which is my target, even if it only same day connecting flight as i`m arriving from KBP only at 4 pm. So i booked KBP-FRA-JFK (LH 3283/404) on july 3 and UA 7683 LGA-IAD on july 4. LH 404 looks to be overbooked by that time. I want to ask in FRA to reroute me on UA 977 to IAD(they don`t know about tarif restrictions in FRA, do they?) Is it possible? Any suggestions, please
PS is it possible to get exit row seat for not elite, btw?