TORONTO — How many of us have sat on an airplane, teeth chattering and shivering in our seats, wondering why on earth must the air conditioning be on at full blast?

Too many of us, we suppose, since arctic temperatures in airplanes are a common occurrence. But why does it have to be? If airplanes – the very existence of which is a miracle unto itself – can magically stay afloat in the sky, why, pray tell, can’t they get something as simple as temperature control right?

Turns out, the problem lies in the age of the aircraft, reports Bravo. According to retired Delta captain Paul Eschenfelder, as cited in Traveller, the older the aircraft, the colder it is onboard. Newer airplane models are able to regulate temperature in different areas of the cabin right down to the exact row. However, older aircraft aren’t built to do this, which means they have to use the same temperature throughout the cabin.

As such, while some passengers are left overheated with little to no relief, others are being blasted with cold air.

So what can you do about it? Pack plenty of layers, or a sarong or shawl. You can request an extra blanket from the flight crew if one is available. And you can also ask a flight attendant to change the temperature; if it’s a newer plane, it can be done.

And as Jezebel noted, if you’re able to pre-select your seat, avoid the back of the plane where it’s often chillier. And choose a seat that’s at least two rows away from any exit doors as they can often be the draftiest seats onboard.