I think it matters if your original VH is up where you spawned from.
Did a PT sortie and spawned out right at the spawn point, I spawned in waited a few then spawned out without moving.
I got a "you are captured" landing.
I noticed that the VH had been bombed and knocked out while I was spawned out.
I waited for VH to come up spawned a PT out to a far spawn point waited a minute or 2 and spawned out. Got a landed successfully.
So it seems if your originating VH is dead you cannot land successfully.
This also works with GVs on some maps. If you spawn to an adjacent airfield, no AC or GVs around take no hits you can spawn out and get a successful landing if your VH is still up, if your VH is down I always get a ditched even tho I met no NME or took anyfire.
These are just GENERAL rules of thumb I use as they dont always work, but for the most part they do.