I normally Fly Alaska Airlines, the putative successor to Hughes Air Late (Air West) of yeasteryear - which is a way of saying being stuck in Seattle is an all too common 'experience'. BTW - the airline will almost always claim Force Majure .(Act of God) and tell you to pound sand...IF, and that's a big if, you are lucky, they will give you a voucher for a couple of bucks against some airport food - if anything is open. SeaTac has improved over the years and now at least a couple of places stay open 24/7. This normally requires a hike, but is within the security zone.. .
I carry serious snackage (almonds, granola bars/fruit leather) and in the winter, a small pot that will boil water for tea. The pot holds the snacks, tea and maybe a pair of socks.
The bag also has a window protector (foil backed bubble stuff) and a former 1st class blanket form the AA folks. This allows me to rack out on the floor, as the seats in Seattle/Tacoma airport are designed to not allow you to layout on the seat - all have armrests or large gaps.
So, fleece jacket on top of blanket shiny pad under. With the mat to sleep on (I know it's clean, eh?) head goes on bag and wallet in the front pocket closest to the floor. I face the wall if a spot is open.
My RON kit also holds a change of underwear, a basic shave kit (disposable razor, small bar of soap, a small section of ShamWOW for a washcloth and a microfiber towel) 'camping' toothbrush and small tube of toothpaste. .
The pot is plugged into a handy outlet and hot tea + granola bars make for a good start to a bad day.
Raptor is correct, the Alaska 1st class lounge (with eats) can be entered as a member of Club 49 (no cost to AK residents IIRC) and a small fee. The chow and a chance to crash well worth the entry fee. Other airports may have the same setup.
Another out for me (as a Vet) is a USO lounge, if one exists/is open. Awesome places.
The RON kit also includes a hand held wide-band transceiver (VX05) (https://www.universal-radio.com/catalog ... 5spec.html
) - good for monitoring local hams, airport tower traffic, AM/FM broadcasts and so on. I always carry the AA battery pack in case the NiCads go dead. AA can be had world wide, so a good choice. Tucked into the radio carry holster is a paper with airport frequencies and local ham repeaters for the airports/areas I will fly into/thru. See https://www.radioreference.com/
for major US city data sets. WARNING with P-25 and encryption, much of what is out there cannot be heard on a common ham HT.
This is normal for me, but it really got driven home as I just missed being at SeaTAc during the big quake a couple of years back. Not knowing what was going on would have sucked big time.
I also carry a fero rod, FAK, 1 liter SS water bottle (Klean Kanteen) w/nesting cup, chlorine dioxide tabs, a pair of large bandanas and a mylar sheet - this if I have to leave the A/O.
Up to now, none of this has gotten a second look by the weenies @ TSA. On my last trip a couple of months ago, the ferro rod had the TSA good puzzled, but after a short delay (I stayed silent) I got my swag back and was on my way. Normally they go right for the ham gear - and I carry a copy of my license in the wallet. The few times I've carried a full HF station (MFJ-9200) with tuner/battery pack I've not had an issue.