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Banned in search engines?)

AIR TICKETS - AIR TICKETS CLASSES
The booking class is a letter designation of the quota of seats on the flight corresponding to a particular fare. The ticket class determines the service that you will receive during the flight. If the regular dinner included in the ticket price is offered to everyone regardless of class, then free alcoholic drinks will be provided only to first class passengers. However, if you are flying abroad, and especially to Europe, then it is hardly worth overpaying - even in the economy class of international flights, there is quite high-quality service and comfortable conditions that meet European standards. Moreover, you will have to overpay a lot - the prices for air tickets of the same company for the same flight can differ by half (if you compare the first and economy class). Under each fare, the airline has set a booking class N, V, R, M, K, H, B, Y and quotas of seats for sale in this subclass. Moreover, the cheaper the fare, the smaller the quota of seats. It is clear that if all the seats are sold at the minimum fare, then the flight is unlikely to justify itself economically. Therefore, cheap tickets are always scarce. The airline determines in advance (purely technically) how many seats in a given price quota it will sell on a flight. Of course, the division into quotas varies on each flight in each season.
First grade
R R - supersonic class
F R - premium first class
P F - first class
A A - discounted first class
Business Class
And J - premium business class
B C - business class
D D - discount business class
Ш Z - discounted business class
Ы I - discounted business class
Economy class
Yu W - economic premium
C S - economy class
E Y - economy class
F B - economic discount
C H - discounted economy
K K - cheap class (economy with a discount)
L L - cheap class with a discount (economic class with a discount)
M M - tourist class (economy with a discount)
H N - economic discount
I Q - economic discount
T T - economic discount
В V - economic discount (youth class)
X X - economic discount
Е E - shuttle tariff; redundancy is not allowed; Seats are confirmed at check-in
U U - shuttle tariff; no reservation required; places guaranteed
G G - group class - redundancy under certain conditions
O O - economic discount
The level of service in class C may be the same or higher than in class Y, but lower than in class J.
The level of service in class M can be the same or lower than in class Y.
When selling with seat numbers, only 16 subclasses can be used, when selling without seat numbers, 26 subclasses can be used.