** Shares of U.S. airlines lower as oil prices increase for third session on Monday
** Brent crude rises above $80 a barrel to its highest in more than four months, driven by wider U.S. sanctions on Russian oil and the expected effects on exports to top buyers India and China
** Atlanta-based Delta Air Lines DAL.N down 3.6%, while JetBlue Airways' JBLU.O shares fall 4.8%
** Southwest Airlines' LUV.N stock falls 1.7%, American Airlines AAL.O down 4.5%
** Alaska Air ALK.N and United Airlines UAL.O down 2.8% and 3.7%, respectively
(Reporting by Rupali Chaudhary in Bengaluru)
((Rupali.Chaudhary@thomsonreuters.com))