The redevelopment gives United room for larger aircraft and adds an 800-seat club at its Houston hub.
Southwest posted US$270m in Q3 profit and record third-quarter revenue as fuel expense rose US$821m.
Saudi authorities report normal air traffic at King Fahd International Airport while assessing damage from Wednesday's attack.
American posted record third-quarter revenue, but higher fuel costs pressured earnings and its full-year outlook.
United posted US$17.9bn in Q3 revenue, but higher fuel costs weighed on earnings and its fourth-quarter outlook.
A global review of commercial flight
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