I am sure this has been asked elsewhere but I can't find the thread. I am starting to think about a booking to EU for November. UA/LH doesnt fly to the city I need to go to, so I will just book into another city and grab a separate flight or train to where I need to go.

Is there a way to quickly check multiple gateways for R space on a semi-flexible (ie, +/-1 day) basis? Eg, to/from EWR/IAH/ORD->LHR/FRA/BRU/AMS/MAD/MUC?