In this age of shrinking seats and expanding waistlines, not to mention taller people, would employees not be able to refuse to fly or require accommodation (read: PY or J) when required to fly? I had one employee suffer DVT and it's not nearly as lame as its portrayed to be. Incidentally she suffered this during a flight in PY.

Rights of Employees
The Canada Labour Code gives you the following rights:

Right to Know
You have the right to be informed of known or foreseeable hazards in the workplace and to be provided with the information, instructions, training, and supervision necessary to protect your health and safety.