Actually, there are yogis in Siddhaloka, without any flying machine, they can go from one planet to another. Durvāsā Muni, he went. Within a year, he came back. He went to Vaikuṇṭha planet. Yogi, great yogi. He saw the Supreme Personality of Godhead face to face, but he was not excused. He went to beg pardon so that he may be saved from the sudarśana-cakra. So he went to Lord Śiva, Lord Brahmā, and all big, big demigods: "Please save me. The sudarśana-cakra is after me." So everyone said, "We are unable to do anything. You can go to Lord Viṣṇu." So he went to Lord Viṣṇu, he saw Him, he talked with Him. And Lord Viṣṇu also said that "I cannot do anything. You must go to Ambarīṣa Mahārāja and fall down on his feet and beg his pardon. Then you can be saved." So this is the position.
And Ambarīṣa Mahārāja was a devotee. He did not know anything. He was simply depending on Kṛṣṇa. So just see who is powerful, that... Even the yogis are not so powerful as the devotees. Why? Because devotee's fully surrendered to Kṛṣṇa. Fully surrendered means "If Kṛṣṇa likes, He will save me; otherwise, I don't try for myself. I have to simply serve Kṛṣṇa. That's all." And Kṛṣṇa takes charge of your saving. And when Kṛṣṇa wants to kill... Just like Prahlāda Mahārāja. Ordinary... not ordinary, but a simple boy, and how much torturing was going on upon him by his father! But he was saved by Kṛṣṇa. Ultimately, when it was intolerable, then He appeared and killed the rascal. So therefore devotees are akāmaḥ.
They don't have any desires. Even in greatest danger, they do not ask Kṛṣṇa. That is pure devotion, anyābhilāṣitā-śūnyam (Brs. 1.1.11).