If you were to watch the bees every hour of the day, you will see triggered scurry flights or as my wife calls them, traffic jams at the beeport! What triggers small bursts of airborn activity is varied and usually not something us humans can spot - it's a bee thing.
But many times a day, bees (a few hundred or more) can just take off stretch their wings, buzz around the hive a little and bottle neck up (especially if you have reduced entrances) until everyone gets back into the hive.
Sometimes, you are talking bees who have never flown before - it really isn't orientation, that involves a bit more than just leaving and landing, although (like pigeons) bees take longer flights as they leave the hive for their first flights. But these scurry flights are fairly frequent throughout the season and PERFECTLY NORMAL activity.