Modo avión literally translates to "airplane mode". It's a modern and relatable phrase that has a double meaning in the context of this song.
While it refers to the phone setting, the singer uses it metaphorically to describe how he and his partner are shutting down communication and avoiding confrontation in their failing relationship. They're putting their feelings and problems "on airplane mode" to avoid dealing with them, highlighting a breakdown in trust and honesty.
Ever been in a relationship that feels more like a performance than a real connection? In "Modo Avión," Elder Dayán Díaz sings about a love that has run its course, where honesty has been replaced by a cycle of lies. The singer decides it's absurd to continue a relationship where the only reason they call each other is to fight. There's no trust left, and both he and his partner are hiding things from each other.
He paints a picture of mutual deceit, where both of them make up the same kind of excuses: "I had no signal," or "My phone was about to die, so I put it in modo avión (airplane mode)." The song's title becomes a clever metaphor for their intentional disconnection. He sarcastically suggests they deserve an Oscar for their acting, but ultimately calls for them to stop pretending and admit the truth: the love is gone and it's time to end things.