An avionic system including: a memory that stores a selectable hash table assigned to a flight plan of an aircraft fleet, the hash table including table elements with operational parameters of an airport, wherein airports covered by the table elements are airports flown to according the fight plan of the aircraft fleet; and a plurality of ground stations situated at the flown to airports of the fight plan, wherein the ground stations are linked via a communication network to a central processing unit; a receiver of the central processing unit that receives, via a communication network interface, a transmission from a detection device, the transmission including at least parameters regarding a time interval parameter of an airport closing and an airport identification.
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