There is this MS145 flight from Cairo to Abu Simbel with a quick stop in Aswan which I was trying to book.

However, neither EgyptAir nor any OTA allows you to book the entire MS145 trip. All bookable itineraries require you to deplane in Aswan and take a later flight to Abu Simbel.

Not only is this the case for MS145, but for the other "non-stop flight" MS147 between CAI and ABS, it also seems like you aren't allowed to book the entire trip.

Why is EgyptAir not allowing people to book MS145/147 all the way to Abu Simbel, despite both segments are operated under the same flight number and with the same bird? Thanks for any help!