The album was primarily produced by Romy in collaboration with Fred Again and Stuart Price, and consists of dance-pop influenced by the likes of Everything but the Girl and Calvin Harris.

The lead single, "Strong", was released on 14 November 2022, and features Fred Again, who also produced with Romy and Stuart Price.

[10] On 11 December, a music video was released for "She's on My Mind" starring Maisie Williams and directed by Vic Lentaigne, and four tour dates were announced in 2024 for Los Angeles, New York City, Buenos Aires and Santiago.

[11][12] Mid Air is considered dance-pop, with The Guardian's Alexis Petridis saying it "sets out its stall at the point where pop meets the dancefloor.

[13] He also noted "hints of Daft Punk's filtered French house", said the song "She's on My Mind" contained "breezy Euro-disco", and that the album "most frequently evokes [...] the early 00s wave of ultra-commercial trance hits.

The music I heard that made me feel more alive and less alone",[5] as well as "a diary of our [Romy and her wife, Vic Lentaine's] relationship"[5] and about "grief, mental health and processing".

[15] Uncut felt that while it is "an album occasionally rooted in grief following the loss of Romy's parents, it seeks to take those moments of joy and dancefloor elation".