We are flying Air Berlin: Venice-Berlin, Berlin-Frankfurt, and AA: Frankfurt-DFW. The AA portion is in J and the first 2 segments are in economy as that's all Air Berlin has. We will overnight in Frankfurt, but will be there for less than 24 hours. My understanding is that we are allowed to use the OW lounges in Venice and Berlin since we are connecting to an overseas flight in J, but the OW agent says no, not allowed?