Mr.AircraftEngineer on Instagram: "Ryanair’s 737s with built in airstairs aren’t just a budget quirk, they’re structurally different from most of their counterparts. The airstairs are integrated into the forward fuselage door, supported by reinforced hinge mounts and a compact hydraulic or electric actuator system. This setup adds around 120 to 150 kilograms to the aircraft’s empty weight and slightly shifts the center of gravity forward. Because of that extra structure, some airlines skip the f