
If Peter switched to Team Cap at the airport, Tony would have turned on him
The person suggesting this went so far as to say that if Peter switched to Team Cap in the airport fight, Tony would have let Peter be arrested. Partly because Tony didn't know about the Raft. (But in that case it wouldn't matter because Tony SAW the Raft and did nothing to protest or free the captives.)
I'm not sure I agree. We've seen how Tony treated Natasha (hurtful digs instead of serious discussion about their plan) and we've seen how Tony treated Peter (belittle Peter's accomplishments, offer a bribe, assume Peter will do what he wants, threaten).
So how would the airport flight play out if Peter switched sides?
***
Sam watched as the web guy grabbed Barnes' arm and said, "You've got a metal arm? That's awesome, dude!"
Sam wanted to launch himself while Web-guy was distracted, but instead he walked over and asked, "So you signed on for all that Accords crap? You don't have an ankle monitor. Did Stark put the tracker in your suit? Or did he go full X-Files and stick it up your nose?"
The guy dropped Barnes' arm as his eyes widened. Web-guy said, "What? Tracker? What are you talking about?"
Sam walked closer and said, "Wait, Stark didn't tell you? Did you even READ the Accords?"
Web-guy shrugged and said, "Well, um, no. What is - trackers?"
Sam shook his head and said, "You're enhanced, right? So you have to register with the U.N. Then they put a tracker on you because you're not allowed to go ANYWHERE or do ANYTHING without their say-so."
Barnes said quietly, "Like stop five Winter Soldiers from taking over the world."
Sam nodded and continued, "And if you DO, you get locked up without lawyers."
Web-guy wrapped his arms around himself and said, "Mr. Stark didn't tell me ANY of this. Just that Captain America thinks he's right but he's wrong. And to uh, go for the legs."
Barnes snorted as he looked over at Sam. Sam nodded and asked, "Now that you DO know, what are you going to do about it?"
Web-guy straightened up and said, "We can't - I CAN'T let five Winter Soldiers take over the world. So I guess, um, should I, uh, try to talk to Mr. Stark?"
Barnes looked at the guy and asked, "You think it would do any good?"
The guy's shoulders slumped as he said, "No, I guess not."
Then he looked at Sam and asked, "Do you, uh, need any help?"
Sam grinned as he clicked on his comm and said, "Cap, change of plans. Web-guy is on our side now."
Web-guy stood tall again and said, "SPIDER-MAN, not Web-guy. Geez."
Sam pulled a comm out of a pouch on his suit and said, "Okay, Spider-Man. I'll catch you up on the situation as we regroup. Welcome to the team."
***
The fight went VERY differently. Spider-Man running WITH the Captain's team made Vision pause after he fired the laser into the cement instead of demanding surrender.
When Mr. Stark and War Machine landed, War Machine said, "What the hell? I thought that guy was with US."
Mr. Stark stepped forward and said, "You better think hard about this, kid. We're not pulling punches anymore. Get back over here or I promise you, you will NOT be home in time for supper."
Peter felt all eyes on him as he straightened up and said, "Mr. Stark, did you know that there are five Winter Soldiers about to be released? Why are you trying to stop them - US - from stopping THEM, um, the BAD GUYS."
He shook his head and continued, "And why didn't you tell me that enhan - the Accords - did you put a TRACKER on me?"
Everyone on Iron Man's team straightened up. War Machine asked, "Where did you get this guy, Tones? He sounds a little young."
Mr. Stark waved an arm and said, "I didn't exactly carbon-date him."
He looked at Spider-Man and said, "You are making a serious mistake. No more suit, no more help - and WHEN we take down Cap and these clowns, you'll get to share a cell with them. That what you really want?"
Peter looked at Team Iron Man, then looked at Team Cap.
Cap said, "It's your call. You can just walk away. It sounds like you didn't have all the facts. This doesn't have to be your fight."
Peter stood tall and said, "I told Mr. Stark. When you can do the things that I can, but you don't help, and then bad things happen, they happen because of you."
He looked at Captain America and said, "I'm with you."
Vision landed and said, "I find this situation troubling."
He looked at Mr. Stark and asked, "You did not provide full disclosure before he joined the team?"
Peter shook his head and said, "Mr. Stark didn't even provide full disclosure NOW. We're going to stop FIVE WINTER SOLDIERS. And the guy who's going to wake them up? Is some doctor dude who probably set the bomb."
Black Panther stepped forward and asked, "Barnes is innocent? Have you proof of this?"
Cap shook his head and said, "Not exactly. The doctor is the one who triggered the Winter Soldier in Berlin. The doc told me he wants to see an empire fall. We think he framed Bucky for the bombing to bring him out of hiding and learn the Soldiers' location."
Black Panther looked at the Winter Soldier and said, "The need for vengeance may have clouded my judgement. I will go with you, and cause no harm to you until I see proof of the matter. You have my word."
Captain America nodded and looked to the rest of Team Iron Man. He said, "We will go through you if we have to, but we don't want to."
Black Widow nodded and said to her team, "We played this wrong. Stand down."
Iron Man whirled on her and said, "It must be hard to shake the whole double agent thing, huh? It sticks in the DNA."
He raised a gauntlet and pointed it at Black Widow, but Peter shot a web that stuck Iron Man's arms to his sides.
Peter blushed under his mask as Black Widow gave him a little smile and nod while Ant Man said, "That is AWESOME!"
The expanded Team Cap moved toward the quinjet as Black Panther quickly explained he had his own plane hidden nearby.
Peter glanced back to see War Machine and Vision watching them leave while Mr. Stark struggled to free his arms.
Mr. Stark shouted, "I trusted you! I believed in you! You traitor!"
Peter's head ducked down as he kept moving forward. Suddenly he felt a hand on his shoulder and looked up to see Captain America walking next to him. Cap said, "What you did back there, I know it was hard. Doing the right thing sometimes can be. You've got a lot of heart, kid. Where are you from?"
Peter smiled and said, "Queens."
Then Cap smiled at HIM and said, "Brooklyn."
Then there was a pinch as the back of Peter's suit was pulled and he heard a rip. He looked back to see the Black Widow holding a small device. She said, "Yes, there was a tracker."
***
Peter didn't actually get to fight the Winter Soldiers. When Cap found out how old he was, Cap sent Peter home with Hawkeye and Ant-Man. The three of them had their own mission, planting the tracker on a plane heading to India so if Mr. Stark tried to catch them, he would head in the wrong direction.
But it all worked out, because Hawkeye had them smuggled out of Europe with a CIRCUS. All the way back to New York. Peter got a job offer to join as a new trapeze act. It was SO COOL.
At first Peter was afraid Mr. Stark would come after him, but Hawkeye promised that there would be NO WAY Mr. Stark could risk people finding out he turned Peter into a child soldier. So Peter wasn't surprised when Mr. Stark never bothered to talk to him again. Peter found he didn't mind at all.