Stock trade loses

What happens to investment of other players when an airline goes bankrupt or liquidize?

What is meant by Stock trade loses in balance sheet?

Is it the total amount invested and lost by the player in the liquidized or bankrupt entity?

After all liabilities including pay-offs are satisfied the remaining cash is paid out to shareholders. This amount is shown in PLA position miscellaneous revenue, while the total book value is depreciated in stock trade losses within the PLA. (None of them are actually shown in the balance sheet.)