no-fly, no-fly zone

Volcanic ash turns much of Europe into no-fly zone
Volcanic ash continued to disrupt air travel across Europe Saturday. UK air traffic control has warned the situation is likely to worsen while German airspace will remain closed until at least 8 am Sunday.

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Definition of no-fly in English:

no-fly

Entry from US English dictionary

ADJECTIVE

Denoting a list or category of people, or a particular person, prevented from flying for security reasons.

no-fly zone 

Pronunciation: /ˌnəʊˈflʌɪ ˌzəʊn/ 

NOUN

An area over which aircraft are forbidden to fly, especially during a conflict: 1988a United Nations' no-fly zone