I am traveling with a pet in cabin inside a carrier later this is month. I am in first class in the A321. Usually try and do window seats but according to seat guru the window seats have IFE boxes below saying limited under seat. Should I stick with aisle seat or risk doing the window? Anyone have any experience with this?

I fly with a pet carrier on average once a year, always in First. My rule of thumb is that if it�s an Airbus aircraft I select an aisle seat and if it�s a Boeing aircraft I select a window seat. This tends to allow the most room for a pet carrier in my experience.

That said, I was on the A321neo about two weeks ago (without a pet) and noticed how both seats were extremely limited in underseat storage whereas the non-neo A321/320/319 seemed to have more. That said, I would still select an aisle seat on the neo.

Any specific Delta pet in cabin questions feel free to message me or post in this thread. Have learned lots over the years and always happy to pass along info.

Have you registered the pet on the flight yet? Delta knows the underseat dimensions and will ask for the kennel size when you register. They won't allow the kennel in a seat that does not meet the requirements. You will have to call

Dimensions are also available online:
https://www.delta.com/us/en/aircraft/airbus/a321

Are you flying alone or with a companion? IIRC, the first class seats don�t have a strut between the seats, which gives more width than published.

The above link is a good resource for checking the general under seat dimensions, and is the same info a reservations phone agent will reference. That being said, the dimensions do not accurately account for any IFE boxes and/or struts between the seats. That's why I then further suggest Airbus Aisle and Boeing Window for traveling with a pet carrier just based off of personal experience. If selecting contrary (or opposite) to that you might have an issue with the length of the carrier due to struts, IFE, or a protruding console.

The height of the carrier can be a pain on any aircraft (well, except the 717s and former MD88s). If you'll notice the max height dimensions for F on an A321 is listed at 10.5". Most pet carriers are around 11" in height, with 18x11x11 being the most common on the market. If soft sided, these are easy to squish down somewhat to make them fit. On the AA website it actually specifically says this is an allowed practice, and DL does not. I once had a phone agent refuse to book my pet with an 11" high carrier due to a 10.5" limit. I called back and the second agent happily did. I've now gotten to where I will fudge the dimensions somewhat when booking just to avoid agent issues if they ask specifics. For an 18x11x11 carrier I will now say something like 17x10x10 just to avoid this. Or, most recently, the agent asked "Is the carrier 18x11x11 or smaller?" To which I replied "yes" and was no issue. Just FYI depending on how strict of an agent you might get.

I would not recommend anything bigger than 18x11x11 on any aircraft. If it's feasible to have a companion travel with you, I highly recommend that for the ability to move the carrier to the adjoining seat if it would fit better, and/or possibly in the middle between both seats. We've gotten to where if we take our pet, both of us travel with her. It makes it easier on having options to stow the carrier, and also doesn't mean a seat mate would be surprised to sit down next to a pet in F. (Though I've travelled solo with our pet before, and only once had someone make a remark).

Once the ticket/PNR is issued, use pnr.sh to verify the agent listed PETC correctly as an SSR for each segment. And with any schedule changes, make sure this sticks to the new flight.

One last tip, I highly suggest a thermal pack you can fill with ice from a fast food place in the airport. Having that in the carrier, along with a portable battery operated fan does wonders for keeping our Bichon Frise cool.

Thank you everyone for the suggestions! I did add her to my reservation with the dimensions two weeks ago and they couldn't speak to the IFE box, but she has used this carrier for so many flights I can not count. I am just bringing her home from LA to help a friend out for a few months while he has to travel for his job extensively internationally for 2 months. Just want her to be comfortable as well as myself. I know window economy works well for them but I am 6'4 so I wanted us to both enjoy the flight home.

I've recently done the 321neo in F in both window and aisle with an in-cabin pet. Window felt more cramped underseat, though still doable. On the neo I would still strongly prefer the aisle because it's hard enough getting out of that darn window seat without worrying about the pet at your feet.

(I always tell my seatmate, because, while my dog sleeps most of the time on the trip, when the plane comes to a stop he often lets out quite a screech to remind me that he exists and should not be left behind. Which, I hasten to add, has never happened!!!)