“Oh no, we’re completely different!” Said the three aircraft ponies at unison, their voices almost indistinguishable from each other and their sentences ending at the same exact millisecond, with only barely noticeable voice inflections.  
The three ponies looked at each other in confusion, and one of them, the pony with the 19 on her cheek, said in a skeptical tone to the rest “Okay, it’s uncanny how many times we do that”, the other two plane ponies nodding in confirmation, the plane pony with the 15 on her cheek and the blushing adorkably pointing out “That wasn’t intentional, by the way.”, to confirm that they didn’t do that just to add more confusion.  
The messenger plane pony in front of the trio, with a mail saddlebag, just looked at them with entertained confusion, giggling a bit. “Alright, so let me get this straight, you aren’t the same pony?” he said, trying to figure out this thing.  
“No, we’re sisters!” said again the three ponies in a similar unison voice as the first time, the three ponies looking back at themselves in apparent confusion and one of them just said “You know what, I’ll start the talking”, which the others promptly accepted.  
“As I… We said, we’re sisters” she continued in a matter-of-factly tone, looking back at her sisters. “I’m Red Horizons, and I’m a Mikoyan Gurevich MiG-19, you can see it by my number” the plane pony on the center said, pointing her hoof at herself, slightly brushing her chest fluff.  
“I’m Red Airspace, and I’m a Mikoyan Gurevich MiG-17, you can also notice it by my number too” the pony on the left said, proceeding to gently tap her cheek with her hoof to confirm that she has the 17 number on her cheek.  
“And she is Red Skies, a Mikoyan Gurevich MiG-15, again, the cheek indicates the aircraft” she finalized; keeping her matter-of-factly tone she started with, the alluded MiG-15 raised a hoof in slight embarrassment and looked away bashfully.  
“Most likely that love letter you’ve got there is for my sister Red Skies, or the MiG-15, or at least, that’s what we assume” The MiG-19 replied, looking back at her bashful sister.  
The mailpony looked at them attentively, and, after they finalized, he resumed “So, you’re a Mig-17, and your name is Red Airspace” he said, pointing at the one on the left, which she nodded in confirmation. “You’re a MiG-19, and your name is Red Horizons” he continued, looking at the one in the center, who also nodded. “And you’re a MiG-15, and your name is Red Skies” he finalized, looking at the pony on the right, who instead of nodding just shyly smiled to him.  
“Have you thought of changing your name or atleast getting a new paintjob?” He said, slightly exasperated of the sister’s similitudes.  
“Well… we have, but it’s kind of funny to see people confuse us” The MiG-17 admitted.  
“….Alright” the mailplanepony just said and looked back at his saddlebag “So, alright, this letter goes…. ‘to a fighter plane pony with a gray and red paintjob and a number on the cheek’, fucking yay!” he said, his tone was one of an angry and irritated worker that has to deal with stupid stuff from their colleagues.  
The three plane ponies looked at each other in confusion “Oh… alright… now we’re confused and intrigued, who it may be of us?” they almost said at the same time, this time one of the sisters being observant enough to not talk this time.  
“Well… I have no idea” the mailpony said honestly, looking at them with an ‘I have no idea’ expression that corroborated his testimony. “Wait” he said, and turned the note. “Here says… ‘To all of the three, they’re all beautiful machines and I would cuddle them all, signed, Tupolev Tu-16’, and a wink face. Guess you have a bomber that’s mad for the confusing trio” He said with slight sarcasm, he was happy that he finally solved this and could go away to deliver others letters, but he choose to stay a bit to see their expressions.  
And sure he was thankful for staying there to watch it, since the three plane ponies blushed deeply at the sentence and looked back at each other and at the mailpony. A couple of “What” and “Eep…” were shared among them as they looked at themselves, then the three said at unison “That was unexpected”, looking at each other and this time not caring that they did it at the same time.  
“Alright, so who’s the first one to cuddle, or you’re going to pounce all on him like you fighters do to bombers?” He jokingly teased the trio, referencing the fact that they were fighters and the letter was from a bomber. The plane ponies looked at him and blushed harder, the tip of their ears becoming even redder somehow. “S-shut up” They said synchronized, embarrassed of the mailpony’s idea.  
“Ohhh, you cheeky little gals, he’s going to have a triple threat, I am right?” He kept teasing, raising a fascinating eyebrow and looking at them with a dreamworks face. “Whatever you do, don’t be that rough, you have numerical advantage” he finished, his job of embarrassing the poor plones was done and now he was free to take off and deliver more packages.  
Meanwhile the three plane ponies looked at themselves, this was the first time they ever got a love letter, and it was for the three at the same time!  
Meanwhile… the MiG-15, now finally saying something, just uttered a soft and shy “So… should we cuddle with him or…?  
A drawing I made of the MiG-15, the MiG-17 and the MiG-19, but ponified! :D. Because cuteness and also yes! As you already know I made them extremely fluffy because I love fluffiness, but I also made them near indistinguishable from each other for the story. And I was lazy and I didn’t make a background, sorry >.<  
The numbers on her cheeks indicate what plane they are, but, if you’re silly or don’t want to look at the drawing again, then; from left to right: MiG-17, MiG-19 and MiG-15. I made this drawing mostly because with a friend I confused the MiG-17 with a MiG-15 (I see you OttPone), and I said “Hey, why not make a drawing of my failures! Yay!”, and so this drawing was born! :D  
I admit I had no idea what kind of background I could make, so I didn’t make one, really sorry.