However, it lacked in all the other ingredients including shredded tuna, cucumber and diced onion.
One person joked that it looked "amazing", while another suggested to grab a meal before heading onto the plane.
So long as it's not a hot meal, because according to Jet2's policy – "You may not bring hot food or hot drinks on-board the aircraft."
While some saw the funny side to Alex's sad sandwich, others weren't as sympathetic – with many defending the budget airline.
"Personally I've had great times flying with jet2 and they honestly try their hardest to provide health and safety for all passengers," one TikTok user wrote.
"It's the catering staff and cooking staff not jet2!" one person pointed out.
"It's aeroplane food from Jet2, what did you expect?" another wrote, while a fourth added: "I always get a cheese and ham toasty when I'm on a flight (jet 2) and its actually rlly (sic) good."
One person came to Alex's defence, claiming many would have had a similar reaction if they too were served the same sandwich.
"Why is everyone so mad – you would've felt the same," they wrote.
Meanwhile, a pilot who works with LoganAir recently revealed why food tastes so different on planes.