What were some potential modifications that could be made to laws applying to major ports or aerodromes under this amendment?
Some potential modifications that could be made to laws applying to major ports or aerodromes under this amendment include:

1. Excluding certain major ports or aerodromes from the application of specific laws made by Parliament or State Legislatures, as specified in the public notification.
2. Modifying existing laws to apply differently or with exceptions to major ports or aerodromes, as specified in the public notification.
3. Causing certain existing laws to cease to have effect in any major port or aerodrome except for things done or omitted before the specified date, as per the public notification.