The paper introduces a new approach to substantiating the quality indicators of the elements of an automated aircraft flight data preparation system. The approach consists in solving the primary task of substantiating the so-called “simple requirements” imposed by the customer. The study examines the place this task takes in estimating the efficiency of the use of an aircraft grouping. The most general problem that determines this efficiency is to ensure that the grouping fulfills its tasks in a given quality. To solve the problem, we introduced the concept of aircraft information readiness. The study shows that the solution of the problem of estimating the quality of reachability and aircraft flight data preparation is reduced to the primary task of setting reasonable requirements for the quality of an automated data preparation system and methods to meet these requirements. However, the problem is hard to solve, as well as the general problem of ensuring the efficiency of the use of an aircraft grouping. The study proposes a general approach to substantiating the quality characteristics of the elements of an automated aircraft flight data preparation system. Among simple requirements, we singled out the verbal requirements related to the quality of the system’s output data. Relying on this approach, it is possible to develop a system whose quality indicators of the elements will correspond to the required values.