American Airlines, which cancelled 1,100 flights to and from Charlotte, North Carolina, on Sunday, has cancelled 400 Monday flights. Those cancellations are also centered in Charlotte, where it has a major hub. The airline said most of the flights canceled Monday were on smaller jets operated by regional carriers including its wholly owned subsidiary PSA Airlines. Those carriers shuttle passengers between Charlotte and smaller cities in the region. Southwest also cancelled several morning flights to and from Charlotte, according to FlightAware.<br/>