You have identified a problem. Now as a DM solve it for your players.
Boots of flight reward
Ring of flying reward
Scrolls or potions of fly found in treasure
Found in a treasure maybe a mission where they get one of these as a reward.
You have identified a problem. Now as a DM solve it for your players.
Boots of flight reward
Ring of flying reward
Scrolls or potions of fly found in treasure
Found in a treasure maybe a mission where they get one of these as a reward.