A.,
Some children, including my daughter, are more prone to display symptoms of "separation anxiety" no matter what. My daughter is now 20 months old, and she's been going to the same daycare for the past year. She STILL cries when I drop her off on most mornings. Then again, she also cries when I leave her with her daddy. In order to alleviate my fears and confirm that she really only cries for a few minutes (or less) as the teachers said, I started dropping her off, then standing just outside the door until she stopped. I have discovered that the tears are just a show for me. Most mornings she stops in less than a minute, and she has a sparkling personality the rest of the day. She just doesn't want to see her mommy go.
Talk to your care provider. Ask her about your son's mood during the day, whether he only cries for a short period or if he's crying for you off and on during the day. Once you've heard her perspective, when you drop him off in the morning, see if you can hang around outside (out of his view) and see just how long he cries. Also, ask your care provider every day how his day went, how her day went, and if she noticed anything that you should be wary of (such as increased crankiness). Not only will this help you learn how she communicates, it also helps her feel like you are willing to work together to make both of your lives easier.
Even if he cries for you off and on throughout the day, it also may be possible that NOTHING bad has happened, but that Landon just hasn't built a bond with his care provider or that he is getting bored throughout the day due to lack of stimulation. If the bond hasn't built, that may just take time. If he's getting bored from lack of stimulation, talk to your care provider. If she's not able to offer him the proper channels through which to expend his energy, you may want to look for another care provider.
Of course, your relationship with the care provider is just as important as your son's. If YOU cannot communicate well with her, if you are asking questions for which you get vague answers and no details repeatedly, then you still may want to look for another care provider. You must be able to trust her.
I wish you the best of luck.
A.