phpvms/app/Repositories/AircraftRepository.php

<?php

namespace App\Repositories;

use App\Interfaces\Repository;
use App\Models\Aircraft;
use Prettus\Repository\Contracts\CacheableInterface;
use Prettus\Repository\Traits\CacheableRepository;

/**
 * Class AircraftRepository
 */
class AircraftRepository extends Repository implements CacheableInterface
{
    use CacheableRepository;

    protected $fieldSearchable = [
        'name'         => 'like',
        'registration' => 'like',
        'active',
    ];

    public function model()
    {
        return Aircraft::class;
    }

    /**
     * Return the list of aircraft formatted for a select box
     *
     * @return array
     */
    public function selectBoxList(): array
    {
        $retval = [];
        $items = $this->all();

        foreach ($items as $i) {
            $retval[$i->id] = $i->subfleet->name.' - '.$i->name.' ('.$i->registration.')';
        }

        return $retval;
    }
}