Chekhov’s bicycle. It’s been there the whole time.

↓ Transcript
Panel 1: Maida, with a tear in her eye, takes off her glasses. Maida: "Well. I'm going to bring you the rest of the way. Earth is bollocks, but I'm not going to give up when you're all so close, at last. I'm the one who still has a visa. I'll do what it takes to reunite us for real."
Panel 2: Ibrahim: "I missed you, big sister."
Panel 3: Maida: "See you soon!" Ibrahim's hologram disappears.
Panel 4: Maida is left sitting by herself on the rooftop balcony.
Panel 5: She starts going down the stairs of the building.
Panel 6: Along the way, she grabs the bicycle that they've been keeping just outside her flat.
Panel 7: She rides the bike out the front entrance to the building.