<h1>Airport charges dispute: airline body challenges tribunal's enlarged HRAB computation as exceeding remand and raising tariffs.</h1> The Federation of Indian Airlines challenges the tribunal's July order for exceeding a narrow remand by treating an internal MoCA letter as binding, reopening issues authoritatively settled by the apex court, and substituting AERA's HRAB of Rs 966 crores with an inflated Rs 4,848 crores; the petition raises questions on the binding effect of internal correspondence, sanctity of prior regulatory determinations, limits of remand jurisdiction, and the permissible interference with regulatory expertise.