Two views of the same journey
A flight tracker can help you explore where an aircraft appears in the available data. An airline’s flight-status page can tell you about the passenger service: its planned departure, changes to the schedule, and the details you need at the airport. These views are related, but they are not interchangeable.
If you are watching the sky out of curiosity, the map is a natural starting point. If you are deciding when to leave for the airport, whether to go to a gate, or when to collect someone, confirm the details with the airline or airport.
Read the time as carefully as the position
A position belongs to a moment in time. A smooth animation on your screen does not, by itself, tell you when the last underlying update arrived. Look for an update time if the tracker provides one, and allow for gaps in the available information.
An airline page may show scheduled, estimated, and actual times. A scheduled time describes the plan. An estimate can change. Read the label beside the time rather than assuming every displayed time means the same thing.
Use the right flight number and date
Check the flight number in your booking and the date shown on the status page. If a booking involves a codeshare, the operating airline may differ from the airline whose number appears on your ticket. Your booking should identify the operator.
Time zones can make two perfectly valid times look inconsistent. Read the local date and time-zone information supplied by the airline, especially for an overnight or international journey.
A useful habit
Use the map to explore the journey, then use the airline to confirm the travel details. If the two views seem inconsistent, do not treat a missing marker as proof of a cancellation or a flight incident. Seek confirmation from the airline or airport.