[katnav]

I connected in Atlanta last year. Although 1hour 50 would have been enough time, we were very lucky with a non existent immigration queue and any easy transfer through the airport to a different concourse. We had 2.5 hours and made it with plenty of time but did a lot of reading about connecting in Atlanta in preparation for our indirect flight last year and lots of people had had terrible queues in immigration and been there for 2 hours queueing. Luck of the draw. If you aren't bothered about potentially missing your connecting flight and having to wait for a later flight or worse case flight the next day then go for the cost saving.