When doing an airlaunch via Plane (both plane and orbiter are manned and the root part is the orbiter command capsule) the experience of the planepilot(s) gets reset upon recovery.
Just to be sure: i am using 1.2.7.2 with KSP 1.4.5
Edit:
To reproduce:
Craftfile (not a plane but the bug appears and it is faster to reproduce with a rocket)
Cheat 2 new kerbals via the cheat menu with 1 star veterancy
Put them into the two command pods
launch and after a few km separate the bottom stage
fly and land the root stage (upper one)
go back to separation with FMRS
land the booster stage and do not recover the stage
go back to main mission via FMRS
if you switch to the landed booster via the map now, the experience of the pilot is 0
experience also gets reset with direct recovery
end result: root pilot is fine, booster pilot lost all his memory
I hope this helps