Access to the fare calculator is what I'm talking about. That is limited to employees of participating airlines. Each participating airline loads the conditions of their ID/ZED agreements to their carrier specific site. That allows employees of AA, for example, to see airlines, eligibility, and fares applicable to them (i.e., it wouldn't show flights operated by XX if AA does not have an agreement with XX, not would it show a ZED Low fare for travel on an airline with which AA has a ZED Medium agreement).

Your subscirptionis for ID90.com, not to the fare calculator. The fare calculator, though, is used by DL and avaialble to DL employees.