Standard Washington state licenses and ID cards (blue cards) are NOT accepted. All adults must present one of the following compliant ID cards at the gate for entry:
(1) DoD military/civilian/retired/dependent ID card
(2) U.S. Passport
(3) U.S. Passport Card
(4) Foreign government issued passport with U.S. visa
(5) DHS Trusted Traveler Card (NEXUS, SENTRI, FAST, Global Entry)
(6) DHS Permanent Resident Card
(7) DHS Employment Authorization Card
(8) Federal Employee HSPD-12 PIV Card
(9) Washington state Enhanced Drivers License or ID Card (pink or green cards)
(10) State drivers license or ID card from REAL ID Act fully compliant states
https://www.dhs.gov/real-id