Welcome to the Apple Community.
On the MBA, go to system preferences > iCloud and check the find my mac option.
Go to iCloud.com > Find my phone, select your iPad and select the remove option at the foot of the page
Thanks, "Winston" Navigating to iCloud and using Find My Phone (and other devices) still feels a bit arcane, having to go to system prefs on my laptop (MBA?) and then online, and selection options you note (delete device) that I could not find
But it's given me a better handle on it. Off to the learning curve...