Critical marks on treasure maps

This crossword clue is for the definition: Critical marks on treasure maps.
it’s A 31 letters crossword puzzle definition.
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Possible Answers: XES .

Last seen on: NY Times Crossword 17 May 21, Monday

Random information on the term “XES “:

Grand Geneva Resort Airport, (IATA: XES, FAA LID: C02) is privately owned public use airport located 2 miles (3 km) northeast of the central business district of Lake Geneva, Wisconsin, a city in Walworth County, Wisconsin, United States.

This airport is assigned C02 by the FAA and XES by the IATA but has no designation from the International Civil Aviation Organization.

Grand Geneva Resort was built as the Lake Geneva Playboy Club Hotel in 1968, and the airport was marked on the FAA Sectional Aeronautical Chart as Playboy. Commuter air service was available directly from Chicago O’Hare Airport.

Grand Geneva Resort Airport covers an area of 20 acres (8 ha) at an elevation of 835 feet (255 m) above mean sea level. It has one runway: 5/23 is 3,830 by 75 feet (1,167 x 23 m) with an asphalt surface, it has an approved GPS approach.

For the 12-month period ending July 19, 2018, the airport had 1,200 aircraft operations: 83% general aviation and 17% air taxi. In November 2018, there were no aircraft based at this airport.

XES on Wikipedia