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Re:Ask HN: Anybody else EC2 issues on us-east-1? by vacri on Wednesday August 02, 2017 @08:17PM (#14915906)
They randomise the AZ letters, because humans tend to shove things in 'a' before anywhere else - it's a psychological load-balancer.

If you want to figure out which of your AZs corresponds to another account's AZs, you can compare spot-prices, which are individual per AZ. Also, for some reason, my account doesn't have a 'b', just a-c-d-e. Weird.

Re:Ask HN: Anybody else EC2 issues on us-east-1? by misframer on Wednesday August 02, 2017 @08:31PM (#14915971)
They also introduced us-east-1f, and it's the same for everyone because it's new :).
Re:Ask HN: Anybody else EC2 issues on us-east-1? by misframer on Wednesday August 02, 2017 @09:33PM (#14916256)
Not sure why I was downvoted. This was mentioned in an issue of Last Week in AWS [0].

[0] https://snarkive.lastweekinaws.com/issue_14-_US-East-1_Drops...

Re:Ask HN: Anybody else EC2 issues on us-east-1? by nodesocket on Wednesday August 02, 2017 @10:52PM (#14916598)
Interesting that the idea is to distribute load across the zones (because people default to using A), but Google Cloud zones are uniform across all accounts and it seems to work for Google.