TASK DEFINITION: Given a travel related situation, and given a specific question about the situation, summarize the question into a title
PROBLEM: How soon can I return to the US from the UK on an ESTA after abandoning the K1 visa

Background

My finacee and I were going to marry in the US as she was doing a PHD there (she is American). However whilst I was over there on my K1 visa, she decided to transfer her PHD to the UK. So we didn't go ahead with a wedding there.
I returned to the UK after spending the maximum 90 days there. Now I would like to return on an ESTA for a month or so. Ideally, I want to go back right away, I know much of the decision will be made at the border, but I can explain the situation well enough and i'm not concerned with the border officer not believing me as I have the expired K1 with me. I'm just wondering if I may have missed anything obvious? And if I get denied at the border, what impact it will have on future ESTA travel.

SOLUTION: How soon can I return to the US from the UK on an ESTA after abandoning the K1 visa?

PROBLEM: I'm going with a Working Holiday visa to NZ for a year. I'm starting to look for health (or travel) insurance in my country (Chile) to leave with a little more peace of mind.

When I was looking for insurance, the first result got me to this company and it says

[...] a low cost and comprehensive health and travel insurance that meets NZ Immigration requirements.
It is compulsory for Working Holiday Visa holders coming to NZ to work in retail, fruit picking, or hospitality industries to provide evidence of comprehensive travel insurance while they are in New Zealand

I haven't realized it was compulsory to have health insurance to go. And sure enough, I went and read the inmigration website once more

To be eligible [...] hold medical and comprehensive hospitalisation insurance for the length of your stay

even though in the actual visa I got it didn't refer to health anywhere, except maybe

You may also be asked to provide evidence of any other conditions that you were required to meet as part of the working holiday scheme under which you submitted your application.

So, ok, I have to get health insurance. But that leaves me with a whole lot more of questions:

Does anyone know if they'll check it coming in our out of the country?
And what is considered "comprehensive hospitalization"? Should I worry about how much does my insurance cover to know if NZ considers it "comprehensive" and let me enter the country?
Does it matter where I get my insurance, Chile or NZ (don't even know if I can do that from Chile)? I mean, can I arrive in NZ and ask for insurance there or won't I even be allowed out of the airport without one?
Does the insurance has to be for the length of my stay? I don't even have return tickets so I can't really give a date. Most insurance companies in Chile give and estimate for max of 60 days. Can I get and insurance in Chile for those 60 days and look for other insurance in NZ after those 60 days?

I know those are a lot of questions and I'm supposed to post one question per... well, post, but they all relate to the exact same thing: what does "comprehensive hospitalization" means? What are my limitations or exact requirements to decide for an insurance plan or the other? I don't want to pay for a plan and then realize it isn't really what NZ wants and kicks me out...

SOLUTION: Comprehensive health and travel insurance that meets NZ Immigration requirements

PROBLEM: I happened to be looking at a flight from yesterday (as writing) which was drastically delayed...

https://flightaware.com/live/flight/UAL48 (choose "Sept 2")

Now, on the many excellent flight info sites, you can quickly determine if a flight is delayed.

But - is there a way to find out WHY that flight was delayed?

This becomes quite critical if you're on the same flight the next day!

(Indeed for that specific flight, I notice the next day's one is unfortunately already marked as going to be delayed many hours; now I wonder about the next day.)

If you can know why a delay happened, it would surely be useful info if you're on the following versions of a flight.

Is there a way to do this?

(Often if you just "call the airline and ask", the staff in reservations often really don't know specifically.)

The sense of my question is, "If you're on one of the next flights of that flight number, to try to find what the heck is going on...!"

SOLUTION:
Find what caused a current big flight delay?