Am I mis-reading this, or is Denise Lynn stating that for pilots to call in sick is unlawful?
As ATC I would not show up for work if I were unwell, and would not be happy about being told I had to come in. I would imagine the same for pilots, after all, it is a case of influencing and compromising safety if the person is not fit for duty.
I cannot see a case in court being able to prove that a pilot was fit for duty when they have phoned in sick.