If you want to get a free upgrade, To get upgraded for free include leveraging your schedule flexibility, using airline miles, taking advantage of last-minute upgrades and credit card statement credits.if any complimentary upgrades are available. keep a friendly, courteous attitude to improve your chances. conditions to get a free upgrade in the airline vary from airline to airline. For more info about How do I ask for a free upgrade on my flight,  visit airlines official website or call them & read  the blog  -