Ecological and digital literacy is crucial for people of all ages, including senior citizens, in various aspects of modern life, including airline reservations. Senior citizens should be familiar with the basic operation of computers, smartphones, or tablets. This includes knowing how to turn them on and off, use a mouse or touchscreen, and navigate the device's interface as well as should be comfortable using the internet to access airline websites and make reservations. This includes knowing how to open a web browser, enter a website URL, and perform searches. Thus, the purpose of this study is to examine senior citizen’s behavior and to improve their digital literacy in booking air ticket by using application in their smartphone. The population of this study is comprised from Thai senior citizen aged 60 and above and 40 samples are collected via purposeful sampling. The information was subsequently collected by employing a web-based survey. The following statistics were employed in this study: average, mean, frequency, standard deviation, and t-test. According to the findings, senior citizen frequently utilizes digital technology while transferring money to another account and purchasing things online. Typically, they bought home amenities, food, and beverages. After learning how to utilize digital technology through our instructional material, seniors have dramatically boosted their digital literacy rate in booking their airline ticket online at the statistical level of.01.