Some questions about plotting arty

[Lomaster]

Both questions concern an arty strike "memory" once plotted

1) Do arty strikes keep memory of a spotter? For instance if i have plotted strike A with observer X and then plotted strike B with observer Y, will they keep corresponding modifiers until the barrage is complete or cancelled?
Does it matter which observer is selected if i want to shift the targets in following turns? For instance if i then select observer X, go to "B"ombardment menu and shift all the plotted strikes with observer X selected - will the strikes plotted by Y lose their modifiers?

2) Do air sorties keep memory of entry/exit directions once plotted, or are the directions updated each time the target spot is adjusted?