Niki (Austria) (Vienna) will launch several new seasonal routes next summer season: Graz-Heraklion: weekly A320-200 service starting on May 15 Graz-Las Palmas-Tenerife Sur: weekly A320-200 service starting on May 6 Graz-Linz-Ibiza: weekly A320-200 service starting on June 9 Vienna-Reykjavik Keflavik: weekly A321-200 service starting on June 16