Are these flying ants in our house??.

Hi guys. 

I live in Denmark Central Jutland. 

We have a house here and have been getting this bug, that looks like flying ants to us. 

Can anyone help identify what these might be? 

Edit 2: Looks to me like a flying black ant (i guess they are called Carpenter Ants)based on this comparison: ibb.co/0QM9n0K


ibb.co/DYbGkkt

ibb.co/znrqcmb

ibb.co/rwQ50JG

ibb.co/L99ZZSm

ibb.co/SPn1Why

Our fear is that its some kind af wood eating bug. 

Edit: We have been spotting about 1 day for the last week.