Most flight delays in aviation enterprises are related to air traffic management and technical centers. This can happen for various reasons: untimely removal of defects, lack of spare parts, deficiencies in maintenance scheduling, etc. Another reason may be inefficient management in the system of preparing the aircraft for departure. The article suggests a possible option of such an assessment as well as the results obtained from the use of this methodology applied to a specific airline.
Andris Vaivads, Jevgēnijs Tereščenko and Vladimirs Šestakovs
The article presents a semiotic model of “aircraft conditions” in flight and multilevel structures of an aircraft. The hierarchical structure of abstract models is divided into blocks and levels that make them more compact by applying a mathematical apparatus corresponding to the goals sated. The above models were tested on the basis of statistical data on TU-154 aircraft failures for 10 years. Various aircraft functional system failures in flight were examined. The state of the aircraft is identified by normative indicators recorded in the “Aircraft Technical Operation Manual”.
Ruta Bogdane, Aleksandrs Bitiņš, Vladimirs Šestakovs and Yasaratne Bandara Dissanayake
In this article, the authors offer a methodology for determining the quality of airline performance by taking into account the level of flight safety on the basis of factor analysis and the results of methodology approbation in the conditions of a functioning airline. The assessment of the level of airline performance quality taking into account the level of flight safety within a certain time span is rather sensitive, informative and reliable. They allow us to detect those changes in industrial and economic conditions and factors that are related to a certain degree of potential deterioration of flight safety. This creates conditions for revealing the tendencies towards the deterioration of flight safety at the stage of their origin, when they have not yet caused deep, irreversible changes in the flight safety of an airline.
Computing with words is a way to artificial, human-like thinking. The paper shows some new possibilities of solving difficult problems of computing with words which are offered by relative-distance-measure RDM models of fuzzy membership functions. Such models are based on RDM interval arithmetic. The way of calculation with words was shown using a specific problem of flight delay formulated by Lotfi Zadeh. The problem seems easy at first sight, but according to the authors’ knowledge it has not been solved yet. Results produced with the achieved solution were tested. The investigations also showed that computing with words sometimes offers possibilities of achieving better problem solutions than with the human mind.
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 European Commission., 2015. An Aviation Strategy for Europe. European Commission. [online] Available at: http://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:52015SC0261andfrom=IT [Accessed 12 November 2017].
 Flightontime., 2015. FLIGHTONTIME.info - Thomson Airways Charter and Scheduled FlightDelays and Punctuality. [online] Available at: http
Next, we exposed human-derived breast MCF7 and colon HCT116 cancer cells to centrifugation and thermal stressors as described previously. Figure 9 depicts the evolution of both breast and colon cancer cells over the time span of 130 h or about 5.4 days when exposed at various temperatures: 37℃, 30℃, 20℃, and 10℃. The main reason to conduct these thermal studies for this time span is based on the possible suborbital flightdelays and to allow for traveling time. The in-vitro experiment is expected to be at the PPF 3 days (72 h) before launch. Flightdelays