1.) No, checked baggage fees are NOT waived for DL elites. (You got lucky in DFW )

Those who are exempt from baggage fees are:

• MVP
• MVP Gold
• Confirmed in First Class at check-in
• Within the state of AK
• To/from Guadalajara and Mexico City
• U.S. military personnel on orders

2.) Those allowed through the premium security line in Seattle:

C-concourse Checkpoint:
MVP Gold
First Class on AS
QX Shuttle Passengers

D/N Checkpoint:
MVP Gold
First Class on AS
UA First/Business Class
UA Premier Exec, 1K & Global Services
Star Alliance Gold