The LGA region is really just EWR, and CHI and ORD are also the same region. We have some overlap of codes as we build out in different datacenters / providers. There’s discussion happening to standardise these codes, but nothing to announce just yet.
The “Gateway” regions are those that have wireguard/ssh entrypoints into the Fly network, so when you run fly ssh console you always go through a gateway.
The available regions have edge nodes that do proxying and TLS termination and of course the Firecracker VMs themselves — and sometimes the edge nodes will report their code as different nearby airport from what we designate the VMs hosts with 