I suggest you to stay away from the JustFly!
I am the first-time user of this agent. Unfortunately I double booked the flight tickets for exactly the same passengers, the same flight, and the same days, due to clicking on two tabs of the same web page. I realized this booking error, and called JustFly to ask for cancellation of one booking, within 10 mins after I booked the flights. The customer service insisted on charging me $150 for cancellation fee.
Their rules are ridiculous to me. How come JustFly allows multiple bookings of the same passengers for the same flights on the same days? How come this agent charges the cancellation fee for double booking? How come JustFly charges the customers for its own processing error?
I understand individual agents have their own rules. However, this agent blamed customers for all responsibility, even it is due to the agent's own processing mistake. I used many other websites and booking agents, and never had such kind of issues before. Therefore, I strongly suggest people to stay away from this agent.