<h1>User development fee hike reallocates passenger charges and apportions airport infrastructure costs between embarking and disembarking travellers.</h1> AERA revised tariffs for the Fourth Control Period by increasing and differentiating the User Development Fee, fixing it for the control period, and apportioning a target yield per departing passenger among landing and parking charges, UDF and other airport charges. The regulator applied the User Pays principle, allocated UDF between embarking and disembarking passengers based on facility usage, and rationalized landing and parking charges to avoid unduly burdening airline operations while accounting for planned terminal reconstruction.