Excellent questions.

Here is a scripture about the Spiritual Airplanes.



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Srimad Bhagavatam 4.6.27

tara-hema-maharatna-
vimana-sata-sankulam
jushtam punyajana-stribhir
yatha kham satadid-ghanam


TRANSLATION

The airplanes of the heavenly denizens are bedecked with pearls, gold and many valuable jewels. The heavenly denizens are compared to clouds in the sky decorated with occasional flashes of electric lightning.


PURPORT

The airplanes described in this verse are different from the airplanes of which we have experience. In the Srimad-Bhagavatam and all the Vedic literatures, there are many descriptions of vimana, which means "airplanes." On different planets there are different kinds of airplanes.

On this gross planet earth, there are airplanes run by machine, but on other planets the airplanes are run not by machine but by mantric hymns. They are also used especially for enjoyment by the denizens of the heavenly planets so that they can go from one planet to another. On other planets which are called Siddhalokas, the denizens can travel from one planet to another without airplanes. The beautiful airplanes from the heavenly planets are compared here to the sky because they fly in the sky; the passengers are compared to the clouds. The beautiful damsels, the wives of the denizens of the heavenly planets, are compared to lightning. In summation, the airplanes with their passengers which came from higher planets to Kailasa were very pleasant to look at.



and another

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Srimad Bhagavatam 4.9.56

prakarair gopuragaraih
satakumbha-paricchadaih
sarvato 'lankritam srimad-
vimana-sikhara-dyubhih


TRANSLATION

In the capital city there were many palaces, city gates and surrounding walls, which were already very, very beautiful, and on this occasion all of them were decorated with golden ornaments. The domes of the city palaces glittered, as did the domes of the beautiful airplanes which hovered over the city.


PURPORT

Regarding the mention of airplanes here, it is suggested by Srimad Vijayadhvaja Tirtha that on this occasion the demigods from higher planetary systems also came in their airplanes to bestow their blessings on Dhruva Maharaja on his arrival at the capital of his father. It also appears that all the domes of the city palaces as well as the pinnacles of the airplanes were decorated with ornamental work in gold, and, being reflected by the sunshine, they were all glittering. We can observe a specific distinction between Dhruva Maharaja's time and modern days, for the airplanes in those days were made of gold, whereas at the present moment airplanes are made of base aluminium. This just gives a hint of the opulence of Dhruva Maharaja's days and the poverty of modern times.





We are currently 5012 years into Kali-Yuga, with 427,000 years left until Satya-yuga, or the Golden Age begins. We do not desire to stay here until the Golden Age happens, it is easier to get out of the material world in Kali-yuga than it is in Satya-yuga.



There is a physical battlefield left over from the time the Bhagavad-gita was spoken. There are various deities throughout India that are self manifested, without record of installation and incapability by man to carve such things with his own hands.


Devotional Service:

The Bhagavata Purana teaches nine primary forms of bhakti, as explained by Prahlada:
(1) sravana ("listening" to the scriptural stories of Krishna and his companions),
(2) kirtana ("praising," usually refers to ecstatic group singing),
(3) smaranam ("remembering" or fixing the mind on Vishnu),
(4) pada-sevana (rendering service),
(5) arcana (worshiping an image),
(6) vandana (paying homage),
(7) dasya (servitude),
(8) sakhya (friendship), and
(9) atma-nivedana(complete surrender of the self).
(from Bhagavata Purana, 7.5.23-24)


Reading the Bhagavad-gita and other Puranas and Upanisads is considered Sravana and Kirtana. This is devotional service, and by doing this you make personal advancement.