Originally Posted by
DOVES
I hope this is not the source you take your aviation knowledge from.
Although it is not completely false you might want to check if what is written there applies to a modern conventional airliner post 1960's.
The MiG 15 purportedly showed such behaviour mentioned in the Wiki article. Quite a number was said to be lost for that reason over Korea.
However, as @clevland has mentioned time has moved on and the designers have taken steps to mitigate this problem. Twist and taper/ relative chord thickness will take care of it.
Empirically swept wing airliners which have stalled showed rather a mush- down behaviour (see also AF447) when applying lots of Nose up Trim to prevent the nose from dropping.
(There have been only very few cases of an airliner stall without siginifcant Nose- Up trim, the high Altitude stall/spin of a Tu-154 when trying to climb above a TS over Russia being the odd exception but that was a T- Tail)
Deep stall is a phenomenon that in its proper sense only exists in T- Tails.
In conventional tails you can simulate somewhat similar effects with violent Nose Up trim + Elevator.
There are no documented cases of a conventional tail airliner pitching Nose Up due to stall with a neutral trim and elevator.