"Contrail" is a song by Japanese recording artist Namie Amuro, taken from her eleventh studio and second Japanese–English bilingual album Feel (2013). The singer was approached by the Tokyo Broadcasting System team to record the official theme song for their television series Flying Public Relations Office, which resulted into the process of "Contrail". The track was written, composed, arranged and produced entirely by long-time collaborator Nao'ymt, and recorded at Daimonion Studios in Shibuya, Tokyo. Musically, "Contrail" is a dance number that includes instrumentation of synthesizers, keyboards and a drum machine. A self-empowerment anthem, the title derives from the literal term, and is delivered as a metaphor for confidence and hope.