Why was the Tupolev-144 withdrawn from service? 

The Soviet Union’s only supersonic passenger aircraft, the Tupolev-144, beat the Anglo-French Concorde into the air, its first flight taking place on December 31, 1968.
However, this aircraft, of which 16 were produced, only entered regular passenger service 10 years later and only for a relatively short time.
Why?
In the Russian press, the main reason given for the aircraft’s withdrawal was that it was “problematic and not economical”.
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For example, the Soviet-designed engines of the TU-144 used twice as much fuel as those of the Concorde as well.
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In addition, the plane’s airframe had a relatively short life of 500 hours.
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Another issue affecting the use of the aircraft were regulations issued that prohibited it from flying at night, in icing conditions, and on wet runways.
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Although the TU-144 was certified to fly to 18 airports in the Soviet Union, it only ended up flying to two.
In its seven months of passenger service, the TU-144 carried 3284 passengers.
According to Vladimir Putin, the tickets, which had been planned to be sold at a price of 80 rubles, an average citizen’s monthly salary, could not come close to meeting the costs of operating the flights.
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Also, there were two fatal crashes in a relatively short time, with 16 people being killed, 8 on board the aircraft and 8 on the ground.
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These occurred during demonstration and testing flights in Paris and Moscow and no paying passengers were involved.
In the end, only two of the 16 TU-144 aircraft produced operated a regular service between Moscow and Alma Ata in Soviet Kazakhstan for 7 months, between November, 1977 and May, 1978.
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Although during the 1980’s some TU-144 aircraft hosted a flying laboratory and broke speed and altitude records, its commercial flying days were definitely over.
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Ultimately,  Putin would propose that one of the remaining aircraft become a museum.
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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: When was the TU-144’s first flight?
A: The TU-144 first flew on December 31, 1968

Q: When did the TU-144 enter service?
A: The TU-144 entered regular passenger service in November 1977.

Q: What routes were flown by the TU-144?
A: The only commercial route flown by the TU-144 was Moscow - Alma Ata .

Q: Where did the two crashes involving the TU-144 occur?
A: in Paris and near Moscow.

Q: Were there fatalities in accidents involving the TU-144?
A: No passengers were killed,  but the flight crews and people on the ground were lost.

Q: What was the main reason it was withdrawn from service while Concorde survived?
A: It was not  economical to operate.

Q: What was one disadvantage of the TU-144 compared to Concorde?
A: Engines used twice as much  fuel.

Q: How many TU-144’s were produced?
A: 16 aircraft were produced.

Q: What did Vladimir Putin propose to do with one of the remaining TU-144’s?
A: Use it as a museum.