First timer here...flying on Delta in January. Leaving out of TRI first class with a layover in ATL, main cabin from ATL to MBJ. Main cabin again MBJ to ATL and first class ATL to TRI. Could not book first class for each leg but I keep checking to see what is available. Can anyone tell me: 1. How will boarding be handled in ATL and MBJ? Will we be boarding as main cabin? I ask because in "my trips" the trip is labeled as Sky Priority. 2. What will my baggage fees be? I know we get two free checked bags with first class but we only have two legs first class (as of now). Thanks for the help.