MLA focuses on the method. For websites, the author is often skipped if not available, and you start with the title in quotation marks.
"Title of the Webpage." Title of the Website , Publisher [if different], Day Month 2017, URL. In-Text Citation: ("Title of the Webpage"). Chicago Style (17th/18th Edition) Author–date citation system - APA Style buy one get one free airline tickets 2017
APA uses an system. If no individual author is listed, use the airline or organization as the author. MLA focuses on the method
Airline Name. (2017). Title of the promotional offer or article . Website Name. URL. In-Text Citation: (Airline Name, 2017). MLA Style (9th Edition) Publisher [if different]