https://forms.business.columbia.edu/sites/forms/files-efs/webform/2023_deming_cup_nomination_and_a/_sid_/How%20much%20is%20the%20penalty%20fee%20in%20%F0%9D%93%AC%F0%9D%93%B8%F0%9D%93%B9%F0%9D%93%AA%20Airlines_%5B%20Copa%E2%80%99s%20fee%5D.pdf https://forms.business.columbia.edu/sites/forms/files-efs/webform/2023_deming_cup_nomination_and_a/_sid_/Spirit%20Airlines%20Cancellation%20and%20Refund%20Guide.pdf https://forms.business.columbia.edu/sites/forms/files-efs/webform/2023_deming_cup_nomination_and_a/_sid_/_How%20do%20I%20file%20a%20complaint%20with%20Expedia_.pdf