Originally Posted by
newyorkgeorge
Google Flights. Just put in your desired dates and leaving from CLT. However, the fares that you will see on the map will likely be BE. Once you pull the fare up you will need to change it to Main Cabin for the Main Cabin fare. However, if you need strictly miles/segments and not EQDs then BE might work for you if you're willing to accept the restrictions.
Be aware that Basic economy flights only earn half the miles and segments than Main Cabin flights so usually Basic economy will not be worth it, especially if you are looking to qualify on segments.