Where are all the aeroplanes!?

[Skyblade]

I mean Adel interfering the radio waves.

Whether or not that was set in stone is up to you to believe.

As for me, if Adel never blocked the radio waves in the first place... I don't think Squall would survive and tell Edea the ideas of SEED and Garden.

The worldwide radio interference was set up as part of the seal put on Adel, it wasn't her messing with the airwaves.