When we first looked last June/July for November flights they were all over £400, we left it and tried again in October, we got the same flights for £1300 for 4 adults & 1 child using Airline Network.

Just had a look and can see no problem with flights from Gatwick to MCO via Charlotte using US Airways, I checked a few different dates from early November to mid December.

As an example I got these prices for November 10th to 24th

Adult Fare 4@£265.00 = £1060.00
Child Fare 1@£146.00 = £146.00
Airline Failure Protection £20.00
Insurance £178.00
Insurance Premium Tax £31.14

Child Paper Ticket 1@£10.00 = £10.00
Adult Paper Ticket 4@£10.00 = £40.00

Adult Tax & Airline Fees £216.00
Child Tax & Airline Fees £54.00
Total Fare £1705.14

Total Fare £1496.00