Can a summoned air elemental fly while carrying a spellcaster, in effect providing a short term copy of the Fly spell?
A Halfling male druid has a base weight of 30 pounds, and a modifier of (2d4 x 1) additional pounds. So max weight is 38 pounds.
A Small Air Elemental has a strength score of 12. This means a Light load is 43 pounds or less, and a Medium load is 44 to 86 pounds. Max load for Strength 12 is 130 pounds.
Suppose I have a Halfling male druid weighing 43 pounds total which includes a minimal set of gear. He casts Summon Nature's Ally II and conjures a Small Air Elemental with a Fly speed of 100. He instructs the air elemental to carry him.
Can the Druid fly in this manner until the duration of Summon Nature's Ally II expires (minimum three rounds)?
Can he cast spells while being carried, just like the Fly spell permits?
Am I missing something which prohibits this use of this spell in this manner?
Note: I am asking if this is possible. I am not asking if it is a good use of resources.