I've been chatting with the Senior Advisors for hours yesterday and today. We've been trying everything to solve this problem of mine. My Airdrop of my MBA cannot be searched by other iOS devices. However, other iOS devices are doing the jobs just fine. Therefore, we know something is wrong with the MBA 2013.
We've tried resetting NVRAM, SMC, wireless network, reinstall the OS X, change a different router, setting up a test account, and other things too.
However, none of above worked for me.
At the end, he asked me what kind of third party apps I have, and i gave him a list of the app i have. (I was really hopeless at that time and thought that it was not the problem for sure, however, we have already tried everything, why not one more)
Out of so many apps, he asked me to delete "Dr Cleaner, Memory Clean, and the unarchiver", I did not want to troubleshoot anymore, so i just deleted those and restarted the MBA.
You know what!? IT WORKS! WOW!!🙂😁
Hope this helps other people like me having trouble with the AirDrop.
Good Luck!
Cy