Just flew México to NC and Back With Delta.
Had 2 *50 Lbs bags with me including a kite golf bag.
Paid 25usd for the first one and 40usd for the second.
I usually put the TT boards on the bottom of the golf bag underneath the bottom plank.
I don t say I have any board as they anyway can t see it even if they open the bag.
I use an Epic golf bag, http://epickitestore.3dcartstores.com/Transporter-Golf-Bag-_p_50.html