Crutches,
My John Deere manual says to raise the FEL to max height a couple times and check the oil level. Extend the bucket cylinder several times and check the oil level. They instruct you to do this 8 times, but this is for when you replace or rebuild a cylinder, so I would assume that if you do this a few times all of the air would bleed to the oil storage tank like the other poster said. You probably do not have to check the oil level as well. If the FEL acts spongy, do it a few more times.