Customer satisfaction levels with airlines and aspects of air travel The chart and table illustrates the enjoyable customer using aircraft and service at airports. This measure adopted in US over an eight-year period between 1999 and 2007. Firstly, the chart indicates the general difference in this period. There was a regular increase from 65% to 72% in satisfying group. However, the other group was dropped at the same time, and touched the bottom at 24% at the end of the period. According to the table, there were five aspects to judge the satisfaction of users. It is clear that comfort of seats was judged least with 47% in 2007, and the other years did not care about this aspect. After that the percentage of the price of tickets was secondly lowest, but it had a big change with increasing sharply starting at 45% in 1999 and peaking at 65% in eight years later. One cannot deny the fact that the amount of change of courtesy of check-in / gate agents aspect was approximately the same. This means the price and others service on aircraft have been improved, while the service at airports such as courtesy of employees seem to not change.