Guide · updated 2026-11-07

Aircraft swaps and “maintenance” cancellations, explained with the record

Every flight has an aircraft assigned before departure, identified by its registration (the tail number, like C-FXYK). Flight-tracking records keep that assignment and every movement of the aircraft. That is what makes an airline's explanation checkable.

The pattern CBC documented

In May 2026, CBC Go Public analysed flight data and reported 34 WestJet cancellations in which the aircraft assigned to a flight was changed minutes before the flight was cancelled for maintenance, with the substituted aircraft already out of service for days while the original aircraft went on to fly elsewhere. In October 2026, CBC reported four Air Canada cases where functioning aircraft were reassigned and the resulting cancellations were attributed to safety maintenance.

Why it matters under the regulations

Compensation under the Air Passenger Protection Regulations depends on whether a disruption was within the airline's control and not required for safety. The CTA lists choice of aircraft among the matters within an airline's control, and says “required for safety” does not include scheduled maintenance or problems found during it. Whether a particular swap falls on one side or the other is for the airline to justify and, if disputed, for the CTA to decide.

How to read a record

• Registration: the aircraft recorded on your flight. If it is missing, the aircraft cannot be traced.
• Timestamps and their type: a scheduled time is a plan; gate departure and wheels-up are confirmed movements. Only confirmed movements prove an aircraft flew.
• The hours after your scheduled departure: a confirmed departure of the same aircraft on another route within 24 hours shows it was airworthy; no departure for 24 hours, followed by a later confirmed flight, shows it stayed on the ground and that the record is continuous.
• What it never shows: why the airline cancelled, or whether an earlier defect existed. It can contradict a stated reason or fail to contradict it. Nothing more.

A real example

On 7 November 2026, WestJet flight WS2267 from Panama City to Calgary was marked cancelled, as was the outbound leg WS2266. The aircraft recorded on both, C-FXYK, left its Calgary gate as WS2262 to Liberia, Costa Rica, 41 minutes after WS2267's scheduled departure and was airborne 20 minutes later. The record shows the aircraft flying within the hour. It does not say why WestJet cancelled. It does give the passengers a precise question to put to the airline. The full, unedited report is on our home page.