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[Air Baltic, Latvia (www.airbaltic.com).]Search in Google Scholar
[Air Malta, Malta (www.airmalta.com).]Search in Google Scholar
[Air Serbia, Serbia (www.airserbia.com).]Search in Google Scholar
[Alitalia, Italy (www.alitalia.com).]Search in Google Scholar
[Austrian Airlines, Austria (www.austrian.com).]Search in Google Scholar
[British Airways, Great Britain (www.britishairways.com).]Search in Google Scholar
[Brussels Airlines, Belgium (www.brusselsairlines.com).]Search in Google Scholar
[Bulgaria Air, Bulgaria (www.air.bg).]Search in Google Scholar
[Croatia Airlines, Croatia (www.croatiaairlines.com).]Search in Google Scholar
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[Czech Airlines, the Czech Republic (www.czechairlines.com).]Search in Google Scholar
[Estonian Air, Estonia (www.estonian-air.ee).]Search in Google Scholar
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[Icelandair, Iceland (www.icelandair.com).]Search in Google Scholar
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[SAS Scandinavian Airlines, Denmark, Norway, Sweden (www.sasgroup.net).]Search in Google Scholar
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[TAP Portugal, Portugal (www.tapportugal.com).]Search in Google Scholar
[TAROM, Romania (www.tarom.ro).]Search in Google Scholar
[Turkish Airlines, Turkey (www.turkishairlines.com).]Search in Google Scholar
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