What is the ruling on taking a maid to the same city without a mahram after a man requested that at the airport?

The majority of scholars hold that a woman's travel without a mahram is impermissible except in cases of necessity. Some have permitted it when there is no fear of temptation. The one responsible for this woman's travel without a mahram is the man. As for your accompanying the maid, there is no sin in it, as she was already traveling, and this might reduce the negative consequences of her travel.