The pandemic also threatens the future of the industry altogether.
Individual airlines have been tasked with providing new protocols to make boarding safer.
New measures include temperature scanning and social distancing markings.
Safety procedures are estimated to cost airlines millions of euros, and the added costs could prove fatal for struggling airlines entirely.
The Spanish airport authority AENA will be liable for providing “the human, health and support resources necessary to guarantee the sanitary control of the entry of passengers on international flight,” it was revealed in a royal decree published on Tuesday.

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AENA have also been granted special government permission to recover the costs of all coronavirus checks after the state of Emergency ends on June 21st.
The terms are set to be finalised in the coming day between the Ministry of health and AENA.
The Spanish Government said: “The staff or material expenses, which will depend on intangibles such as the volume of tourists that come to Spain in the coming months or the existence of outbreaks in the pandemic, will be charged to the airport tariffs for this and subsequent years until their recovery.”
Plans are in place to support airlines who have been hit hard by coronavirus travel bans.
It is believed the Government may give those airlines the option of paying off the additional fees over several years.
READ MORE Spain holiday airfares to soar as airlines forced to pay for tests
This comes as Spain is yet to entertain the prospect of an “air bridge” for UK tourists.
Experts say the move is confusing as Brits make a considerable portion of the country’s tourism trade.
It was revealed today that residents of Gibraltar, a British Oversea Territory in the Iberian Peninsula, will now be able to enter Spain.
Plans for tourism tests are expected to take place as early as next week.
The first experiment will see 6,000 German tourists fly to the Balearic Islands
Spain plans to reopen its borders two weeks later.