https://www.alaskaair.com/content/ai...tion-and-hours
ANC: 5am-9pm daily (begin 2/25)
JFK: 5am-10pm Sun-Fri, 5am-5pm Sat
LAX: 4:30am-8pm daily (4:30am-11pm Fri/Sat begin 3/23)
PDX: 4:30am-8pm daily
SEA C: 5am-12am daily
SEA D: 4:30am-10pm Sun-Fri, 4:30-9pm Sat
SEA N: 5am-11pm Sun-Fri, 5am-10pm Sat
Only ANC hours are remarked as due to renovation, although elsewhere it states that renovations are under way for all airports except JFK and may result in early closings.