Https://forms.business.columbia.edu/sites/forms/files-efs/webform/2023_deming_cup_nomination_and_a/_sid_/How-to-Connect-United-Airlines-Customer-Service-By-Phone-Number-Chat-and-Email-Options.pdf https://forms.business.columbia.edu/sites/forms/files-efs/webform/2023_deming_cup_nomination_and_a/_sid_/How-to-Connect-United-Airlines-Customer-Service-By-Phone-Number-Chat-and-Email-Options.pdf