While a civil suit lodged against KLM (AIRF.PA) in the Netherlands is one of the most prominent, complaints and cases against other airlines have been mounting. Lockwood said the ASA would use machine learning tools to scan online advertising to catch potentially misleading wording. Separately, the Austrian advertising watchdog told Lufthansa's Austrian Airlines arm last year to stop making claims about a carbon neutral flight using biofuel. The lawsuit alleges that carbon offset programmes don't work as advertised and the company misled consumers. The company is investing in newer planes and sustainable fuel to "decarbonise" its operations, the person added.

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Persons: Miles Lockwood, Lockwood, Joanna Plucinska, Mark Potter Organizations: KLM Airlines, Fossielvrij, Dutch, KLM, Airlines, Ryanair, Lufthansa, Etihad, Standards Authority, ASA, Reuters, Lufthansa Group, Austrian Airlines, Delta Air Lines, Delta, Thomson Locations: Netherlands, Amsterdam, Austrian, Los Angeles