Yes, the best laid plans... I've just returned to Australia following a trip to Europe on AY J class BKK-HEL-CPH-HEL-BKK. The Finnair part of the trip worked flawlessly, with each flight either being on time or early. I had allowed one or two days connect time in BKK both ways, though this turned out to be unnecessary. Luck of the draw, I suppose.
However, this was the least of my problems. I had booked cheapish Ryanair flights (which are usually quite punctual) to fly CPH-BLQ, PIS-LPL, MAN-CRL and CRL-CPH. Leaving at least one night between flights, I thought the itinerary was quite conservative. What I didn't bargain for was the terrorist attacks in Belgium. While CRL wasn't really affected (an hour's drive from Brussels), my flight to CRL was scheduled for 23 March and I didn't want to take the risk of flying to that part of the world and getting caught up in the aftermath, as I absolutely had to be at CPH on 24 March to connect with the return to BKK on AY.
So, I decided to forego the prepaid flights MAN-CRL-CPH and the overnight accommodation at CRL, and book an alternative trip from the UK to CPH. I ended up booking a UA FF ticket LHR-OSL-CPH, which operated flawlessly. In addition, I had to buy train tickets MAN-LHR, but the peace of mind it brought was certainly worth the extra cost. I could probably claim some of the extra cost from my TI, but it isn't a lot and I really can't be bothered with all the hassle that will be involved. Just to show you really can't plan for all contingencies, no matter how hard you try.
I have another trip to Europe ticketed for May, with a connection in BKK to UL business class to CDG. The insurance (in addition to a formal policy) I have so far is a business class award on SQ MEL-SIN-BKK, with a backup on JQ MEL-BKK if necessary, which I am quite prepared to throw away. Of course this may not be sufficient, but hopefully will be...