3 Travel Insiders Share Their Secrets to Scoring First-Class Upgrades

Air travel can be a nuisance. Whether it's standing in long security lines or dealing with little legroom on a flight, flying is not considered by most to be a luxurious affair.

But scoring a free upgrade to first class — while difficult — is possible and can greatly improve the travel experience, air travel experts told MONEY.

Three travel insiders shared several tips on how to increase your chances of scoring an upgrade.