ProjectLaravel/app/Models/Crew.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Crew extends Model
{
    use HasFactory;

    public function flight() {
        return $this->belongsTo('App\Models\Flight');
    }

    public function staff() {
        return $this->belongsTo('App\Models\Staff');
    }
}