The duration of blocks can vary; in addition several blocks with different duration can be superposed to control the concentration of flights within a certain time period.

The first zone would be the zone of greatest ash density, in which there would be an absolute restriction, an absolute ban on flights; the second zone would be the opposite, a zone in which no kind of ash is present at all and is therefore unrestricted for flights; and the third would be an intermediate zone in which there is low ash density, which would therefore allow flights without any risk.

10. Calls on the Commission to probe more deeply into the common policies (on transport, research and technology, agriculture, the environment, and security) for which space policy provides support and which constitute the key areas of public demand, bearing in mind that it is impossible to ignore the fact that, no matter what part of the world might be concerned, investment in space policy needs public resources but that this could be enhanced by involving the private sector; believes, in particular, that the Commission should investigate the potential for more novel and cheaper space concepts, by the offer of a prize, such as that off ...[+++]ered in the USA for a successful sub-orbital passenger flight;

I should like, in any event, to say that safety and the protection of the environment are closely connected to the distribution of airports, which is suffering, in practical and serious ways, as a result of the trend to centralise airports that is prevailing in most European States and which is being promoted by central governments, which, for political reasons and reasons of power, are concentrating investment in capital cities, and by the so-called flagship companies, which, for the same reasons are centralising their flights and sending them into the same airports.

- the quantities of concentrated grape must and rectified concentrated grape must used for enrichment expressed in degrees of potential alcoholic strength by vol. per hectolitre.

(c)the quantities of concentrated grape must and rectified concentrated grape must used for enrichment, expressed in terms of potential alcoholic strength by volume per hectolitre and broken down by the wine-growing zone of origin.