Originally Posted by
swag
1. yes
2. yes
3. it should be enough time, assuming you don't have a big delay on the inbound. But have you considered just renting a car at DAL and driving to Longview? It's only abut a 2 hour drive, so you could be at Longview before the DFW flight starts boarding.
Agreed, taking a taxi from DAL to DFW is 25 minutes the opposite direction of Longview. A rental car from DAL to Longview will take less time than going from DAL to DFW, going through security and catching a flight will take longer than just driving to Longview.
If you arrive at 9:37 AM at DAL you could collect your bags, rent a car and be in Longview by 12:35 PM instead of catching a flight at DFW.