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The term "irregular operations" most often refers to scenarios that disrupt the normal flow of scheduled flights, which primarily includes flight delays and cancellations. These irregularities can be due to various factors such as weather conditions, mechanical issues, or air traffic control constraints. When operations are classified as irregular, it implies that they deviate from the expected operational norms, such as on-time departures and arrivals, which are crucial for maintaining a well-functioning airline schedule.

In contrast, planned flight schedules represent the normal operational framework that airlines work within; routine pre-flight checks are standard procedures that ensure the aircraft is fit for flight and safe for passengers; and on-time arrivals indicate a successful completion of flights per the planned schedules. Irregular operations specifically highlight the challenges and disruptions that airlines face when things do not go as planned.