If I read it correctly, aircraft is not immune to EMP-related electronic failure. Radar control would be vulnerable if more than one block was affected.
Aircraft would be in trouble in the affected area. A car turning itself off isn't going anywhere - it's not moving and one can start it again. A plane that loses power is still going somewhere and that is down.
Didn't this North Korea pos say to countries to get their diplomats out of the country by April 10? I don't think I would fly on April 10 or 11.