Yes It is Portugese, But I think it was CS TMP - What I have seen the past few times I have being to AMS.
They had a 'right carry-on' with this Tristar the other year, It made 3-4 unsuccesful attempts to get airborne!!
On one of the attempts 4 tyres blew on T/O
I think it is owned by 'Luzzair'
It is white with a blue tail.
Staying on the subject of the Tristar, I am happy to see CS TEB still flying after 30+ years.
I hope that helps.