I think you need to investigate further; I do not believe that the trip insurance offered with your flight tickets is truly “comprehensive”. Specifically, I cannot see how it can possibly include medical and evacuation coverage, nor the cost of, say, a tour costing $4000.
It is actually difficult to discover exactly what such insurance (generally called “flight insurance” does cover. To try to find out, I did a “dummy booking” on Alaska Airlines for a hypothetical 3-month trip with roundtrip flights to JFK from Seattle. The cost of the flights came to $712, and the Alaska website booking engine offered to insure this trip for $46.29. It did not name the insurance company, but in the past it did say Allianz, so I assume it is the same. But there was no way to find out exactly what is covered (no link or button for more information), and no way to add extra expenses one wants to cover, such as an expensive tour. Nor do they ask your age, which is a significant factor in pricing medical coverage.
This is all it says:
Success! Your trip to New York is protected.
Compensation
Up to 100% reimbursement for a covered trip cancellation and interruption
Peace of mind
Protection for covered travel or baggage delay expenses
Reliable benefits
Get cash back if your personal belongings are lost, stolen or damaged
Help when you need it
24/7 assistance in the event of a travel or medical emergency.
It would be foolish to assume that this covers more expenses than the $712 cost of the flight tickets and maybe the value of your belongings if they are lost. It certainly cannot cover nonrefundable expenses such as tour costs, which are not mentioned. Nor does the “assistance in the event of a travel medical emergency” imply any form of financial assistance; I assume they mean you can call them for help finding a doctor or hospital if you need it.
Contrast this with the coverages listed on the Allianz website for a “basic: 1-trip policy.
For a 3-month trip to Germany, costing $7500 in flight expense and non-refundable tour costs, they offer trip cancellation and delay, etc., plus $25K medical expenses and $500K in evacuation coverage. The cost is $606 for a person around 50 years of age.
Do you really want to believe the agent who told you that you can get that same medical and other coverage for the $46.29 you would pay for “flight insurance”? Or that if you buy the flight insurance and then call up to add the other expenses and modify the insurance, it will come out way less than buying a comprehensive policy in the first place? You have no way of finding that out that extra cost in advance, so you are truly “flying blind” if you go that route. You also have no way of comparing coverages of different companies, or different plans, etc. You are stuck with Allianz.
Note: I realize this is somewhat like comparing apples to oranges, as I used a domestic USA flight to find the cost of the simple flight insurance, and the other trip is to Germany. This is because I could not get American Airlines to show the cost of flight insurance before the payment page when I tried a dummy booking. Alaska offered it before the payment page, as I knew it would. I always have to check the “decline” box when I book with them.
If someone can figure out the cost and, more important, the coverage of flight insurance through Allianz when purchasing tickets to Europe, I hope they will report back.