In this day and age, I respectfully say: nonsense. My chargebacks were disputed twice until Amex washed their hands leaving me having to sue the airline. But that's documented elsewhere. I also don't want the hassle. I'll fly when things get back to "normal" and only with airlines which obey the law. Having to issue a chargeback or sue the airline when the airline cancels a flight does not come into the category of obeying the law.