  Scattered light imaging studies have detected nearly two dozen spiral arm
systems in circumstellar disks, yet the formation mechanisms for most of them
are still under debate. Although existing studies can use motion measurements
to distinguish leading mechanisms such as planet-disk interaction and disk
self-gravity, close-in stellar flybys can induce short-lived spirals and even
excite arm-driving planets into highly eccentric orbits. With unprecedented
stellar location and proper motion measurements from Gaia DR3, here we study
for known spiral arm systems their flyby history with their stellar neighbours
by formulating an analytical on-sky flyby framework. For stellar neighbors
currently located within 10 pc from the spiral hosts, we restrict the flyby
time to be within the past $10^4$ yr and the flyby distance to be within $10$
times the disk extent in scattered light. Among a total of $12570$ neighbors
that are identified in Gaia DR3 for $20$ spiral systems, we do not identify
credible flyby candidates for isolated systems. Our analysis suggests that
close-in recent flyby is not the dominant formation mechanism for isolated
spiral systems in scattered light.
