Shares of United Airlines tumbled more than 7% on Wednesday morning and took the rest of the industry down with them after the carrier gave a gloomy outlook for fourth-quarter profit, which will be reduced by rising jet fuel prices. In addition, United's revenue could be disappointing the longer that flights to Israel are suspended for the Israel-Hamas war. United reported after the market closed Tuesday that it earned $1.14 billion in the third quarter, beating Wall Street expectations for profit and revenue.