For us? Happens all the time in Boston and New York. At Logan Airport, the security folks even had us wait OUTSIDE the line for a "special cab," and it took over 2 hours to find a cab to take us home to Cambridge. They could care less if I was a service dog. They did, however, charge us $20 more, because I sat with CL during the 10 minute drive home.
CL is not looking forward to returning to Boston in a wheelchair. If they refuse service to a working dog, wonder how the cabbies at Logan Airport will treat a working dog and a woman living life on wheels?