Supplying Norway despite German air power

Could Britain keep supplying troops in Norway despite German air power?

Yes, supplies were still reaching the troops. Withdrawal is explained here by the decision to concentrate on the campaign in France.

British forces were still receiving supplies while fighting in Norway despite the German air presence. Withdrawal is attributed to the campaign in France and the decision to concentrate British resources there. Continuing the Norwegian operation therefore depended on strategic priorities as well as the ability to deliver supplies.