Planes do carry lots and lots of weapons, if you have complete aerial superiority you can be flying strategic bombers a high altitude which can carry tons upon tons and munitions.
Planes are also incredibly fast compared to drones, they are also much stealthier meaning they can weave in and around of air defences more easily than drones.
Aeroplanes also have much further range add to drones. For example with the current striking of targets in Yemen, the British flew their planes from Cyprus to Yemen and back again with a bit of in a refueling.
If you exclude drones, with the exception of cruise missiles, there are very few ways to drop munitions more than a hundred miles away. Cruise missiles are exceptionally expensive compared to bombs.
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