When taking off from a planet, you're supposed to spawn inside the space station safe zone. But yesterday I took off from Arkadia and spawned on the edge of the safe zone, after a few seconds and before I was fully loaded up, the PVP message came on and I was in lootable PVP. There was a red triangle in the area, but I didn't stick around to see who it was. So take this as a warning that this situation can occur. This is especially important for those carrying a large number of stackables up to a waiting mothership or privateer. If at all possible, get up summoned instead.