JAL Air-Observation Jet with Special Livery (Source: JAL Press Release)

Japan Airlines (JAL) has been helping to collect air samples to measure atmospheric carbon dioxide and other greenhouse gases with its passenger aircraft since 1993. In 2005, they have jointly established the Comprehensive Observation Network for TRace gases by AIrLiner (CONTRAIL) Project with other organizations and installed a newly developed Automatic Air Sampling equipment (ASE) and Continuous carbon dioxide Measure Equipments (CME) on its planes. 

Currently there are 4 777-200ERs in JAL's fleet that are equipped with these measuring devices. JAL will paint the CONTRAIL logo on one of them (JA707J) to promote this unique environment initiative. The JAL Air-Observation Jet with this special livery will be mainly flying between Tokyo Haneda and Paris CDG, San Francisco, and Hong Kong (Basically the HND routes with long-haul configured 777).

For more details, you can refer to JAL press release (Japanese, English)