10 of the 'Educational Airliner Mission' packs are dependent on the FlyByWire A32NX being installed.
After it is installed, they will appear under STORM 4 - Educational Airliner Missions in the 'Custom Content' menu within Microsoft Flight Simulator.
STORM does NOT install this aircraft.
You can download and install it from the FlyByWire Simulations website.
Download here: https://flybywiresim.com/
Note: This is not applicable to Xbox owners as they cannot get this mission pack.