TripAdvisor is inviting users to review their airlines and has even created a page with hints on what to include.
A spokesman for the reviews giant said it was testing a 'new design and features' for its airline rating submission page.
Advice on the 'Airline Reviews on TripAdvisor' post includes that users should only review a flight in they have taken in the past 12 months and information should be on the airline's products and services.
What not to submit is anything on travel agents or OTAs, discussion on mileage schemes or comment on other elements of a trip with TripAdvisor's Air Travel Forum continuing for those discussions.
The company says that now, as with hotel reviews, airline reviews written in the above forum will be removed.
TripAdvisor says Airline Reviews are currently only available on its English language sites but the service will be made available in other languages.
The company also posted a guide yesterday for airlines wanting to promote themselves via TripAdvisor and providing instructions on how to get a free listing.
Last year Expedia said was testing airline reviews and had seen a positive impact on conversion since including them in results.
Amadeus also said at the time that it was piloting reviews with a number of unnamed airlines.
TripAdvisor also owns AirfareWatchdog which includes flight reviews.
For more than five years TripAdvisor has accepted ratings of flights, but the reviews are new.