This is devastating news. So sorry you are going through this. It's horrible your stepfather might miss his holiday. The airline will require a fit to fly note signed by a doctor, so the lung consultant saying no/refusing to sign a fit to fly note is a problem. Flying involves reduced oxygen which can be very problematic with lung issues where there may be a need to organise supplemental oxygen. The insurance is also going to be very difficult if not impossible if your stepfather's doctor has advised against travel (check the policy detail as most exclude pre-existing illness). Has the lung consultant said no to any mode of travel or just flying? I've personally had to cancel holidays because of difficulties with insurance and illness and I know how upsetting this can be. 

This is devastating news. So sorry you are going through this. It's horrible your stepfather might miss his holiday. The airline will require a fit to fly note signed by a doctor, so the lung consultant saying no/refusing to sign a fit to fly note is a problem. Flying involves reduced oxygen which can be very problematic with lung issues where there may be a need to organise supplemental oxygen. The insurance is also going to be very difficult if not impossible if your stepfather's doctor has advised against travel (check the policy detail as most exclude pre-existing illness). Has the lung consultant said no to any mode of travel or just flying? I've personally had to cancel holidays because of difficulties with insurance and illness and I know how upsetting this can be.