The information you got about buying two birds so they "have a friend" is totally and completely wrong, and it's horrible advice, as you would likely just end-up with 2 birds that cannot be inside of the same cage, or possibly even be together at all under supervision outside of their individual cages. Parrots form relationships very much like people do: They may love each other, just like each other but not be able to share a cage, just tolerate each other and not be able to be together without supervision, hate each other and want nothing to do with each other, or hate each other and be aggressive and violent towards each other...And there is no way to know how 2 parrots of any species are going to react to each other unfortunately, whether you buy them at the same time, even if they are siblings that were from the same clutch, or if you buy them at different times. You just have no way of knowing what will happen, so no, you never want to "buy a friend" for your first bird...You only buy a second bird because YOU want a second bird as a companion for YOU, and because you have enough time to spend equally with both of them, separately if need be, every single day.
As far as being a commercial-pilot, I can't comment, but no matter what your profession you need to be able to provide a parrot, any parrot of any species, with at least a good 4-5 hours of out-of-cage-time every single day, with a good couple of hours of direct attention with/from you. You have to remember that YOU and the others who live in your home are going to be your parrot's Flock, they are Flock animals, and they have the intelligence of a 3-4 year-old human child, and the reason a lot of pet parrots start to Pluck and Self-Mutilate is because people buy them as pets and think they can get away with letting them out of their cages for an hour or two a day at night when they get home from work and that's it. And that obviously doesn't work, they are like having a human child in many ways, no joke, so if you think you can do that as a commercial-pilot then by all means, enjoy the experience and love your little guy every day...Just don't EVER buy a second bird for your first bird...YOU are your first bird's friend/Flock, and any bird you bring home after that...
***If you're talking about taking trips away from home, like a 3-4 day trip, or any type of vacation, No, you cannot leave a parrot at home alone for 3-4 days without having someone to come and check on them at least once or twice a day, change their food and water, talk to them a little bit, etc. You can't just leave them inside of a cage for 3-4 days and have that be okay...At most about 24 hours is as long as you should leave them without having someone come to check on them, and even that is a long time...
So for your trip this summer to actually get your license, which I guess is going to be a 3-4 day trip, then you just need to either find a friend or family member that you can trust to come and check on your Conure at least once each day, give him fresh water and food each day, some treats, and a little attention and time...And that's what you would have to do for any trips where you're going to be away for longer than 24-hours, like vacations and work trips.I don't know if you live alone right now, it sounds like you do, and I do as well, I've been single now for about 6 years and I own my own home, and I do take week-long vacations, well, I go on week-long road-trips traveling from concert to concert, and I go to a few music-festivals each summer, like the Peachfest, Bonaroo, Lollapalooza, etc...Sometimes I take my dogs with me, I've taken my birds with me, depending on what I'll be doing...But it's a really good idea if you live alone that from the day you bring home your baby Conure, you choose a close friend or family member who is good with animals and who is willing to take care of the bird for you during vacations, trips, etc., and you introduce the bird to them early-on in life so that they know each other and so the bird feels more comfortable, and then when you do go on vacations or work-trips you might even be able to just take your bird over to this person's house and they can keep them with them full-time while you're gone, which is really much better for a parrot than leaving them alone all that time with short check-ins.
***Again, I have absolutely no idea what the life of a commercial-pilot is like, so it's very hard for me to comment on how a parrot would fit into that life-style, and I would assume that just like any other job it is going to depend on exactly where you live, what airport you work out of, and what airline you work for as to how much time you are going to be away from home...I honestly don't know if that's a job where you can leave in the morning and come home in the late-afternoon each day in some cases/positions, or if it's always going to be a job where you are doing over-night trips with long hours and days (if not weeks) away from home...All I can say is that if it's the latter in any way at all, then I highly suggest that you DON'T GET A PARROT as a pet, because it would not only be unfair to any species of parrot, but it will do damage to any species of parrot and will end in one of many possible bad-outcomes for both the bird and yourself, but mostly for the bird. You can't have a human child by yourself and work those kinds of hours and be away for days at a time, and it's no different with a parrot at all...
A lot of people actually think that since they work a lot and don't have much time at home to spend with a pet that they can't get a dog, but that they could get a parrot/bird of any kind they want to because they live in cages and they can let out huge dishes/containers of food and water and they can go for days at a time alone...And that thinking is just so backwards, incorrect, unfair, and ultimately dangerous and harmful to the bird that the re-homing rate for pet/captive-raised parrots is over 80% in the US alone right now...Dogs can handle being alone much, much better than any bird or parrot can, dogs aren't Flock animals, nor do they possess nearly the level of intelligence that any species of parrot does. Not even close! Parrots, all parrots including Parrotlets, Budgies/Parakeets, Cockatiels, etc., use logic and reasoning skills. They all have much better memories than we do. The best way to think about owning a parrot of any species really is to think about what it is like to have your own 2-3 year-old human child, that's as close a comparison as you'll get... So be sure that you're well-aware of your work hours BEFORE you decide to bring home a bird of any species, and if you don't think you will be able to provide at the VERY LEAST 4-5 hours of out-of-cage-time to the bird every single day, with most of that time having YOU being directly involved with them, talking to them, reading to them, playing with them, eating meals with them, and just hanging out with them like you would your own human toddler, then a parrot/bird is not for you. Period. Because you'll only end-up with a bored, depressed, lonely parrot who starts to Pluck and Self-Mutilate themselves out of depression and sheer boredom.