The third and fourth lines of the display list all air carriers that publish fares between the two cities, whether they actually have these cities on their schedule or not. After each two-letter airline code, you see three numbers, for example, AA 4/ 0/ 58. What do the numbers stand for?

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1. The third and fourth lines of the display list all air carriers that publish fares between the two cities, whether they actually have these cities on their schedule or not. After each two-letter airline code, you see three numbers, for example, AA 4/ 0/ 58. What do the numbers stand for?