Another great spotting video by Casey! I have never seen before the Alba Star - B737-800 and i have to say, she looks great! Thank you for interesting and excellent planespotting at LTN, Casey!
Don't have a clue… Perhaps the first aircraft had broken down somehow, and they had no spares on their hands, so they took a plane that just arrived from Olsztyn-Szymany (rare service, thrice weekly) and placed it on the route where the broke plane had to fly on?