I kind of made a risky decision and decided to book a flight with short layover periods. Both are with us airways. The first is a connection at Charlotte Douglas International. It is a 40 min period between my flight from milwaukee to my flight to pheonix. The second flight sounds even worse with a connection from my flight from charlotte in pheonix sky harbor. It is also a 40 min period but this time im flying out international to mexico. What im asking is if these connections are doable and if so by how much? Please share experiance if any and thanks for answering.