The goal of this thesis is to develop a simulation of delay propagation to mimic the real-time airport flight scheduling process. The simulation will follow a first-come, first-served protocol, adhering to runway capacity constraints, minimum safe separation intervals between consecutive flights, and turnaround time. This simulation aims to trace how the delay is propagated under congestion conditions when airport operations follow the FCFS framework both with and without adherence to safety constraints. The results will improve the understanding of the impact of security protocols on delay propagation during peak operational times.