As of 2019, the United States had sold advanced F-35 fighter aircraft to some NATO member countries.
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It had also sold these aircraft to other important allies, including Israel and Japan.
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In November 2019, NATO member Denmark possessed F-35 fighters.
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As of that time it had bought 27 F-35 fighters from the United States, at least five of which were still in the United States because Danish pilots needed to go to Arizona to train on the aircraft.
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At the time, the United States was concerned that NATO had inadequate air power and surveillance capabilities to patrol the Arctic region.
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NATO member Italy also possesses F-35 fighters.
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At least 10 of these aircraft were delivered to the Italian Air Force.
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The long-term plan was for Italy to take delivery of 90 F-35s; however, this plan was in question at the time a new Italian government took office.
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Israel and South Korea also possess F-35 fighters.
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In August 2019, Israel took delivery of 2 F-35 fighters, bringing the total number of F-35 fighters it possessed to 16.
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Israel signed a contract in 2016 to purchase 50 F-35s over the course of 5 years.
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In November 2019, it had 18 of the fighters.
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In October 2020, South Korea took delivery of 24 F-35 fighters.
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By 2021, it expected to receive a total of 40 F-35s from the United States.
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The price of each F-35 jet was $6 million at that time.
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US company Lockheed Martin manufactures the advanced fighter jets.
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Japan bought F-35 fighters worth at least $90 million from the United States to replace its F-4 aircraft.
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After the accidental crash of one of these F-35 jets in April 2019, Japan grounded 12 more F-35 fighters.
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Warning: these questons and answers are not all representative of the way questions will be asked and answered in the pilot, because some questions are compound and some answers do not include citations.

Q: Which 5 countries had obtained F-35 fighters by the end of 2019?
A: DenmarkA: ItalyA: IsraelA: South KoreaA: Japan

Q: How many F-35s did Denmark buy from the United States?
A: 27

Q: How many of these aircraft were in the United States?
A: At least 5

Q: Why had these aircraft not been delivered to Denmark at that time?
A: Because Danish pilots needed to go to Arizona to train on the aircraft

Q: What concerns did the United States have about NATO that prompted it to provide F-35s to its allies?
A: That NATO had inadequate air power and surveillance capabilities to patrol the Arctic region.

Q: How many F-35s did Italy have?
A: 10

Q: How many F-35s was Italy supposed to take delivery of over the long term?
A: 90

Q: How many F-35s did Israel have by the end of 2019?
A: 18

Q: How many F-35s was Israel supposed to receive by the end of 2021?
A: 50

Q: How many F-35s did South Korea have in 2020?
A: 24

Q: How many F-35s was South Korea supposed to receive in total from the United States by 2021?
A: 40

Q: What was the price of each jet at that time?
A: $6 million

Q: Which company produced this advanced fighter jet?
A: Lockheed Martin

Q: How much money did Japan spend on F-35 aircraft to replace its F-4 aircraft?
A: $90 million

Q: How many F-35 fighters did it ground after an accident in April 2019?
A: 12 more