I heard from my travel agent that a man who booked a business class vacation to the ski fields in Canada relied on his credit card travel insurance alone. He suffered an appendicitis attack on the slopes, was air evacuated to a hospital some distance away, his recovery in hospital was slow due to the delay in getting him there, and by the time he got back to Oz his accident cost over $90k. The credit card insurance paid him back but the claim took nearly a year to work through the system. What the credit card company did was increase his card limit by $90k to allow him to pay for the accident but the long delay in settling the claim meant that he was out $21k in credit card interest. So do not think the card pays the claim for you. You pay upfront and they reimburse you later..in this case, much later…with double digit interest accruing.
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The travel agent said that the man had turned down a travel insurance policy which would have cost him about $350 at the time.