STOCKHOLM, Oct 12 (Reuters) - Sweden and Norway, main owners of airline SAS SAS.ST :
* Sweden and Norway to increase sale of shares in airline SAS to 23 mln from 19 mln due to strong demand from investors
* 23 mln shares equivalent to around 7 pct of outstanding shares
* Said earlier on Wednesday they would start selling up to 19 mln SAS shares, equal to around 5.8 pct of outstanding shares ID:nL8N1CI50P