ProjectDB/db_project_laravel/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;

    protected $fillable = [
        'staff_id',
        'flight_id',
        'staff_id',
        'flight_id',
        'commander'
    ];

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

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

    public function __toString(): string
    {
        return "{$this->staff} {$this->flight}";
    }
}