We are flying US PHL-NCE with a connection in FRA to a US codeshare (LH).
It appears US uses C gates and LH to NCE uses A gates.
In the past we have always gone from B gates to A which is fairly simple and entirely airside thru the infamous tunnel but looking at the FRA terminal maps it appears that to get from C to A you may have to cross the public area.
We know we have to pass through passport control but my question is --is it possible to stay airside while sprinting from C gates to the Schengen A gates.
Connection time is around 1+30.
Thanks