We've booked a flight from ORD to LAS in October, and had to settle for a 5+hr layover between arrival from the UK and departure from ORD.
American has now advised a time change to give us almost 8 hours at the airport.
There is an earlier flight that gives us 2hr 15 to clear immigration, recheck bags and transfer from T5 to T3. People who know ORD: is this acceptable or is it cutting it too fine? The international flight and the internal one are on two different tickets.