https://forms.business.columbia.edu/sites/forms/files-efs/webform/2023_deming_cup_nomination_and_a/_sid_/expedia-servicio-al-cliente-de-%C2%BFcomo-hablo-con-una-persona-real-en-expedia.pdf https://forms.business.columbia.edu/sites/forms/files-efs/webform/2023_deming_cup_nomination_and_a/_sid_/american-airlines-servicio-al-cliente-%C2%BFcomo-llamar-a-american-airlines-en-espanol.pdf https://forms.business.columbia.edu/sites/forms/files-efs/webform/2023_deming_cup_nomination_and_a/_sid_/52-united-airlines-ayuda%C2%BFcomo-puedo-hablar-con-el-agente-de-united-airlines.pdf https://forms.business.columbia.edu/sites/forms/files-efs/webform/2023_deming_cup_nomination_and_a/_sid_/american-airlines-de-telefonos-en-el-mundo-%C2%BFcomo-hablar-con-una-persona-en-american-airlines.pdf https://forms.business.columbia.edu/sites/forms/files-efs/webform/2023_deming_cup_nomination_and_a/_sid_/united-airlines-servicio-al-cliente-%C2%BFcomo-hablar-con-un-representante-de-united-airlines.pdf