Can anyone tell why Ryanairs B737's don't need deicing after overnighting in CPH, when all other needed deicing?

"Need" or "company procedures dictate regardless of conditions?"

I'm not a RYR pilot, but you do not state what the actual conditions are at the time of observation.

There is always a lot of unnecessary de-icing after nightstops.

It seems some companies prefer monkey-do instead of letting the crew decide if de-icing is necessary.
Of course that require a knowledgeable flightcrew that knows their winter ops.

I departed about 1/2 hour after Ryanair with an aircraft that had been sitting toward the south and there was about 1,5 mm of frost on the wings and stabilizer. Sun was out and it was +2 degrees, but the frost was just starting to slush up at that time, so absolutely no chance to not deice for us.

Could it be that Ryanair use preventive deicing during overnights when risk of frost?

Similar to this?

What Hotel Charlie said,

Pre de-icing is done at other bases anyway (not sure about CPH) if there's a possibility for frost.

Clearly no contamination on the over wing, nor flight controls of that AIR BALTIC. Good job guys!

The Air Baltic picture is a perfectly acceptable condition. Nothing wrong with that wing!

Nothing wrong with the wing - that's true!

To answer a question: No, RYR does not anti-ice before locking up the aircraft for the night in CPH. They did, for 3 days in a row, sail right past the de-icing stands and went aviating, when everybody - and I do mean EVERYBODY - else had a spray of Type II.

Of course this is not at all economy related; all other operators in Europe are nutters and only RYR have seen the light when it comes to de-icing. After all, what does Norwegian, SAS and Finnair know about cold weather operations.*

* A spot of sarcasm may appear in the above.

I do believe that preventive deicing is not allowed in CPH.