We flew Jet Blue in August 2013.  The nut snack ingredients say it has no peanuts, and although my daughter isn't tna, we just avoid.  I chose JetBlue because it specifically says it doesn't serve peanuts, along with reading the info others have posted here on airlines.  At the gate, we alerted them to our allergy and were asked if we wanted to preboard to clean the seats, and they said they'd have a buffer zone of two rows either way.  At snack time, the couple in front of us asked for nuts.  The attendant just said "no nuts."  I'd fly them again.

I always confirm at the gate and when I preboard to wipe my seat.

 

Likewise.

If I have the option, I will ALWAYS fly JetBlue. They've been by far and away the most consistent, accommodating, and generally on the ball.

United's policies are wildly inconsistent. They don't serve blatant peanuts--I think--but whether they'll ask other people to refrain from opening them is pretty much a grab bag.

Always, always, always 1) call the airline a day in advance, 2) check at the gate, 3) preboard, and 4) check with the flight crew. ALWAYS.

Sun Country does not serve peanuts!!  They're based at MSP, so this is good news.  The fact that a group DS is travelling with wants to use them makes this relevant.  They sell a trail mix that has almonds and cashews, however.  DS is not allergic to those nuts, though of course he won't eat that.  They also sell M&Ms but plain ones.

I recently flew Southwest (and I know most of you would not, but there a few that do) and when the were giving out the snacks, a gentleman asked if they had any peanuts.  The flight attendant politely informed in that there was a peanut allergic passenger on the plane and therefore they were not serving peanuts.  I think they had 4-5 other choices of snacks for everyone.

I only fly Southwest. Disclaimer: I am not airborne or contact reactive. I know this for a fact. For 'just in case' purposes and for my own peace of mind, I preboard, get a seat near the front (I get to be one of the first off this way too, yay), and wipe down everything I'd come into contact with anyway because I have a serious hands-touch-my-face problem. You mark it down online under the disabilities, then you go to the gate agents (not the touch screen do it yourself things) and they print out your ticket and a slip you give the flight attendant when you go on board. They're usually amazing about it.

I would definitely NOT recommend Southwest for PA folk with higher sensitivity though. Note I said "usually". One time, this flight attendant with a queen bee vibe didn't tell anyone and the plane got served peanuts anyway. Again, not an issue for me, but woah not good for other people. Since I knew I wouldn't have a problem, I didn't make a fuss right then and there, but I wrote them when I got home and mentioned that I'm not that sensitive but they could've killed someone, and Southwest, being customer service stars, freaked. They gave me my money back for the flight and then did a whole investigation, and THEN even wrote me back again later to tell me where the communication breakdown happened and that they were doing more training.

I flew on Delta this past week and was told that my flight would be peanut free after I informed them of my allergy. However, as snack and beverage service began the whole plane was served peanuts and there was a very strong odor throughout the plane. Luckily, I did not have a severe reaction. The flight attendants told me (with a little attitude) that they were not told about my allergy. Be careful on Delta!

Be careful on ANY airline.

Seriously-- we flew three separate long-haul flights at three VASTLY different times of day departing and arriving at five different international airports, on three different (but supposedly all "great") airlines-- United, Aer Lingus, and Air Canada-- back in March and April.

I'm a freak about documentation, planning, and advance notice.  I told all three airlines about my daughter's allergies when we booked those flights in DECEMBER.

Not one check-in agent had a bit of information about it.  So we told THEM, too.

Not one GATE agent knew a thing about it.  So we told THEM, too (which was a near-disaster in Chicago as we wished to pre-board the flight and cover DD's seat, wipe things down, etc.).

NOT A SINGLE FLIGHT CREW KNEW IN ADVANCE.  (Except in the case of the Aer Lingus flight, and that only because the gate agent, in a total hissy fit, had opted to "tell" on us in the hope(?) that the pilot would eject us from the oversold flight.)

We were actually IN THE AIR before either the United or Air Canada flight crews were made aware of my DD's nut allergy.

Truly not kidding.  It was amazing and not in a good way.   

I second the "be careful on Delta" sentiment. After reading an article online, I started following Xander Singh from Passion Pit on twitter, he's PA, and they ended up storing the peanuts right next to him at the back of the plane, even though he told them he's PA.

I just did two X-country trips on Jet Blue, which now serves a mixed nut snack (well, mostly sesame sticks to be honest) as one of its snack options.  On the flight to CA, I overheard one of the flight attendants asking people in the rows ahead of me not to eat any nut products because someone in their area had a severe nut allergy.  There was no general announcement, nor were nuts pulled.  IDK what the customer's specific request was wrt accommodation.  Nobody complained, BTW.  Everyone was cooperative.

Beware!  Travelers on any airline can bring aboard their own snacks...like peanuts.  Oh dear! How do I know what's safe for me may not be safe for other possible super-sensitive passengers? This is really scarey! I sure wouldn't want to cause others to be sick.  In my case, for example, I am allergic to some grains, all dairy, and am fructose intolerant--so, I always bring along my own snacks...rarely can I eat any offered airline foods [I stick to water and unsweetened tea to drink].   We usually take along hard cooked eggs, almond/walnut mix,  carrot/celery sticks, and rice crackers. Also, I take along a small can of tuna packed in water to top off a plain veggie salad without dressing which I order at the layover airport.  We travel international so travel is usually a long, all-day affair, allowing plenty of time to go through customs coming into the USA.  Going without food is not an option, since I also have a problem with hypogycemia