827 The Effect of Airlines Delay Towards Customer Retention in Indonesian Low Cost Carrier Muhamad Zidane Fathurahman 1* , Andrea Permata Putri 2 , Basri Fahriza 3 , Rr. Endang Wahyuni 4 , Asep Ali Thabah 5 1,2,3,4,5 Institut Transportasi dan Logistik Trisakti, Jakarta, Indonesia *Corresponding author: zidanefaturahman@gmail.com Abstract Delay is one of the possible problems faced in the aviation world; the airline’s company and the users of the company’s airline services will feel the effect of this delay. This research is aimed to find out the effect of airline's delay towards customer retention in indonesian low-cost carrier with a total of 120 respondents. There are two variables in this research, the first one is the airline’s delay as the independent variable and the second one is customer retention as the dependent variable. This research used a simple linear regression analysis with a quantitative approach. The result showed that there is an effect of airline's delay towards the customer retention and can be proved using simple linear regression (Y = 13.337 + 0.384X). It means that each increasing point of variable X (airline's delay) will affect variable Y (customer retention) which is 0.384 in 13.337 constants. Based on the result of correlation analysis, r = 0.476 shows that there is a medium correlation level between two variables. The determinant coefficient is 22.6% proved that airline’s delay has an affect of 22.6% on customer retention while the rest (77.4%) come from other factors. The result from hypothesis test is t count > t table or 5.875 > 1.980 it means there is a siganificant impact of variable X (airline’s delay) towards variable Y (customer retention). Keywords: Airline’s Delay, Customer Retention, Low-Cost Carrier, Indonesia, Aviation Introduction Hundreds of Low-cost carrier airline passengers have directed their anger towards low-cost carrier airlines for many flight delays (The Jakarta Post, 2015). Flight delays cause a lot of disadvantages for passengers. It can make them late for scheduled events or miss connecting flights, causing anger and frustration. Flights are said to be delayed when arriving 15 minutes or more the schedule. The airline claims that several reasons that cause flight delays are due to flight disruptions, weather conditions, problems with aircraft maintenance, congestion in air traffic,