i am planning a connection in FRA from LH to DL (two separate tickets). the LH flight should arrive at 11:30a and the DL flight departs at 1:45p. is this sufficient time to make this connection? i've done 2 hour connections from UA to LH and vv before no problems obviously, but i am not familiar with the departures for DL back to the USA and where in the airport they are located. thanks!