Naples enters its November shutdown as Salerno prepares a temporary network of 15 destinations and extra ground connections.
Seven gates are due to open October 27, with five assigned to United and two for common use.
Cirium figures show 4,071 Riyadh departures affected October 8–25, while foreign airline suspensions continue.
Jetstar's Gold Coast departure opens passenger operations at WSI, with international services and airport rail to follow.
Riyadh has reopened with prior permission required for flights, while airline suspensions extend into 2027.
The redevelopment gives United room for larger aircraft and adds an 800-seat club at its Houston hub.
Saudi authorities report normal air traffic at King Fahd International Airport while assessing damage from Wednesday's attack.
A global review of commercial flight