About 3 years ago my neice was getting married on a saturday in Horsham. At the reception what I think was the BBMF Lancaster came wandering past in the distance.
Lovely sound anyway
Then 2 weeks later at a friends daughter's wedding , another saturday, we were just taking photos outside the reception hall when the red arrows came wizzing past virtually overhead and very low.
Have you thought of looking at the air show schedule and rearranging the date and time and location of the ceremony to catch something transiting between displays?