In the bustling metropolis of Atlanta, two individuals at pivotal points in their lives, Peter and Emma, confront the fallout from unexpected breakups. Both in their thirties, they have been recently separated from their partners: Peter's girlfriend, Anne, has grown weary of the stagnation that characterized their six-year relationship, while Emma's boyfriend, Noah, has become disenchanted with her perceived irresponsibility. As they grapple with the aftermath of these relationships, Peter and Emma forge an unexpected bond, finding solace in each other's company amidst their shared heartache.
In a moment of vulnerability, Emma shares with Peter her metaphorical depiction of Noah as her "airplane safety mask person," indicating her tendency to prioritize his needs over her own well-being. Initially skeptical, Peter gradually comprehends the profound affection Emma harbors for Noah. As they navigate their emotional turmoil, they devise a plan to win back their lost loves by disrupting the new relationships: Emma aims to entice Logan, Anne's new boyfriend, while Peter sets out to foster a friendship with Noah that will encourage him to reconsider his bond with his new girlfriend, Ginny.
As they execute their scheme, Peter and Emma grow increasingly intimate. They confide in each other their deepest aspirations and insecurities: Peter reveals his lifelong ambition to open a nursing home, while Emma confesses that her lack of drive stems from her father's terminal illness. Their friendship deepens further as Peter and Noah form a robust connection, with Noah stepping in as Peter's personal trainer. Emma, on the other hand, impresses Logan by feigning an interest in theater, delivering a breathtaking rendition of the song "Suddenly, Seymour." Additionally, she provides support to a troubled young student named Trevor, helping him navigate the emotional turmoil of discovering his father's extramarital affair.
As the narrative unfolds, Peter and Emma find themselves together at a nightclub. In a spur-of-the-moment decision, Peter persuades Noah to join three girls for a night filled with MDMA, only to discover that the girls are underage. Disturbed by this realization, they quickly abandon the scene, and Noah later reveals his intentions to propose to Ginny, leaving Peter disheartened. In his desperation, Peter attempts to infiltrate Noah and Ginny's home to plant false evidence of infidelity but ultimately lacks the resolve to proceed. Instead, he witnesses Noah's genuine proposal, a moment that weighs heavily on his heart as his best friend prepares to embark on a new chapter.
Meanwhile, Emma successfully persuades Logan and a reluctant Anne to partake in a threesome, but Anne ultimately communicates her discomfort and decides to mend things with Peter. As the news of Noah's engagement reaches Peter, he finds himself compelled to sever ties with Emma, a heart-wrenching choice that leaves her feeling isolated and sorrowful.
As fate would have it, Peter and Emma become intertwined in a complicated web of relationships once more when they both receive invites to Noah's wedding in Savannah, accompanied by Anne and Logan as their respective plus-ones. The atmosphere is thick with tension as the two former lovers exist under the same roof, momentarily reconnecting and revealing their perceived progress—or lack thereof. Emma shares her renewed passion for becoming a school counselor, while Peter grapples with the aftermath of an embarrassing encounter that exposes his vulnerabilities. Confronted with painful truths, he realizes that Anne never truly supported him, in stark contrast to Emma, who always believed in his potential. In a surge of emotion, Peter confesses his lingering affections for Emma, only to be met with a cool response.
As Anne and Logan mutually decide to part ways with their partners, the two protagonists must navigate the ensuing emotional chaos at the wedding. Tensions escalate when Ginny demands everyone leave, culminating in Noah taking a swing at Peter and knocking him to the ground. In the aftermath, Peter and Anne find themselves reconciling the next morning in a hotel room, acknowledging that their relationship had always been fraught.
Emma, now wiser from her experiences, apologizes to Noah, coming to terms with the fact that she and Peter were never truly meant to be. As they embark on the same flight home, an unexpected bout of turbulence causes oxygen masks to drop from the ceiling. In a decisive moment, Peter securely places Emma's mask before completing his own, symbolizing a newfound commitment to her well-being. As they settle into the aftermath of their chaotic journey, Emma and Peter share a tender moment that highlights their evolving relationship, their faces illuminated by a shared appreciation for one another.
