Airline business frequencies are not licensed to individual airlines (except for a few very old licenses). They are licensed to ARINC d/b/a ASRI, or some form of that name depending on how long ago was the last renewal or modification.
There's all kinds of individual airline frequencies listed here on RR for DTW (Detroit Metro)
Detroit Metropolitan Wayne County Airport (DTW) Scanner Frequencies and Radio Frequency Reference .
If what your saying is true, we need to delete a lot of frequencies