I'm in the early stages of planning a 2015 trip. I'm not sure exactly where I'll be flying to/from in the US, at the moment Salt Lake City is most likely, but not a place served by direct flights from the UK. There are direct flights from Manchester (my local airport) to Atlanta, Chicago, New York, Philadelphia and Washington, so I'd be looking at connecting at one of these.
Am I correct in thinking I'd need to clear immigration & customs at these (rather than say Salt Lake City) and if so what may be a "safe" connection interval? Any comments over any being "easier" than others (less distance between terminals, say).? Anything else I need to think about (long time since I did this so I'm rusty, but do know about ESTA).