We were place on KLM by Delta after we missed our connection due to the poor man management of the US Immigration services in ATL. and this airline is over all other. The food 5*, the staff were friendly (not its my job friendly) helpful and went out of their way in making our travel back as comfortable as possible as we had our 1 and 5yr old. The entertainment choices were great and wide range. The seating area was clean and comfortable. The toilets were clean.
And boarding, they board on time so keep on eye on the board