Two flights with the same number and same destination, 15 minutes apart

I booked seats with Thomas Cook airlines. I tried booking another seat on the same flight but it was fully booked. I booked a seat on the next flight.
I received confirmation of the two different flights. Both flights are with the same airline, departing from the same airport, but departing 15 minutes apart. Both have the same flight number, ie MT508. Is this normal?
Best Answer
That is uncommon, but it does happen. Although normally they have different flight numbers.
I had two other examples just this month (COPA from MCO to PTY, and then PTY to LIM - there are each two flights within 15 minutes, and yes, they were boarding at two neighboring gates, into separate planes). I guess some connections just draw more customers for a certain time of the day than can fit in one plane.
What is possible is that the flight was moved, and one of the two you see now is the old one (before the moving), and the other is the new one. If the planes are different types, the airline is busy for some hours moving all passenger to new seats, and they simple lock the old one as full during that time. Once they have rebooked everyone, the old one will be removed.
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Can there be two flights with the same number?
Yes, the same flight number can be used to refer to multiple flights active at the same time. This happens fairly regularly if a flight is heavily delayed. The previous days flight may still be active the same time as the current days flight takes off.Do connecting flights keep the same flight number?
Short answer: if both flights have the same flight number, you are probably staying on the same plane. If the flight number changes, you are connecting to a different aircraft.Does same flight number mean same plane?
Just because two flights have the same flight number doesn't necessarily mean that you'll have the same aircraft. The way to find out is by going on AA.com and then entering the flight number (1819).Why do airlines use the same flight number for multiple flights?
Often, when airline X sells a ticket to their customer so that he'll fly on a flight operated by airline Y, the flight will have both an airline Y flight number (which is what ATC will use) and also an airline X flight number (which may be printed on the ticket & may show on the monitors in the airport).How to Book Multiple Flights on One Trip with Long Layovers for Maximum Savings
More answers regarding two flights with the same number and same destination, 15 minutes apart
Answer 2
That is definitely not normal. MT508 flies only on Sundays at 21:45 o'clock. You can see its past history here: https://planefinder.net/data/flight/MT508 and the current time table here https://www.thomascookairlines.com/en/book-plan/flight/timetable/timetable-result.jsp?dd=20180625&rd=&oneway=1&o=LGW&d=DLM&action=search&flightMode=OW
Check the time table and make sure that the flight that you have booked shows up there.
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