## 3 Materials and Methods
### Results  
#### 4.2.1 Results--General Information Survey  
In the first part of the survey, the general data were collected. Of the 68 respondents, the ratio of women and men who completed the survey was equal. In total, 50% of users were women and 50% were men, as shown in Figure 5a where blue represents male and red represents female respondents. As per Figure 5b, the largest number of respondents who completed the survey were between the ages of 35-44, i.e., 45.6%; followed by respondents aged 25-34, i.e., 27.9%; followed by respondents aged 45-65, i.e., 19.1%. The fewest respondents were under the age of 24 (5.9%) or over 65 (1.5%). In Figure 5b, the blue group is aged 24 years or younger, red is 25-34 years, orange is 35-44, green is 45-65 years, and purple is older than 65 years. Among the respondents, the majority are those who have completed a college education (undergraduate/graduate studies), i.e., 48 (70.6%); followed by respondents with a postgraduate level of education, i.e., 16 (23.5%); and the remaining 5.9% who have completed high school education. In Figure 5c, blue denotes the group with an elementary school education, red those with a high school education, orange those with a college education, and green the group with a postgraduate education. Figure 5 shows that, statistically, the surveyed respondents are equally divided by gender, most respondents are 35-44 by age, and the majority of them have completed college education (undergraduate/graduate studies). The question about previous (flight) experience is a question necessary for the purpose of understanding the background experience and perspective of the respondent. This question provides insight into the respondent's flight experience, which is very useful in the context of analyzing attitudes, preferences, or satisfaction related to air travel. The largest share of respondents (45.6%) or 31 respondents stated that they had used air travel services more than 21 times, as per Figure 6a. In Figure 6a, blue is 1-5 flights, red is 6-10 flights, purple is 11-15 flights, orange is 16-20 flights, and green is 21 or more flights. It is important to note that greater flight experience is desirable in this research and in this context the proportion of results is satisfactory. The majority of surveyed respondents stated that they belong to the group of passengers who use air travel services on an annual basis, i.e., 40 or 58.8%, as per Figure 6b. This was followed by the group of respondents who fly on a monthly basis, i.e., 22.1%. The smallest number of users fly on a weekly basis. In Figure 6b, blue is weekly frequency, red is monthly frequency, orange is yearly frequency, and green is very rarely (once every 5 years). The proportion of passengers using air travel services for private purposes is slightly higher than that of passengers using air travel services for business purposes, as per Figure 6c. It is important to separate these two aspects in order to better understand the needs and preferences of passengers. The ratio of the above aspects helps to define useful guidelines for adjusting certain parameters. In Figure 6c, blue is private purposes and red is business purposes. Figure 6d shows the dominance of economy class passengers. Of the offered travel classes (blue--first class; red--business class; and orange--economy class), 100% of respondents answered that they belong to the economy class. This is the basic travel class that offers only basic travel services. For example, economy class passengers usually have seats that offer basic seating and limited services such as food and drinks during the flight. This class is the most affordable and offers less comfort compared to the other classes. This segment of passengers is the target group of this research. Statistically, Figure 6 shows that most of the respondents flew 21 or more times, use air travel services on an annual basis, and use air travel services for private purposes, and all of the respondents belong to economy class passengers.