[Hotfix] flightcheck

I've refactored flightcheck "RT - booking contingent diff" This query needed much resources on live DBs. I've split it into two queries. -- -- Sören Pestner - Entwickler - TraSo GmbH Nonnenstraße 42 D-04229 Leipzig telefon: +49 341 355 740 - 49 email: s.pestner@traso.de Geschäftsführer: Haiko Gerdes Handelsregister: Amtsgericht Leipzig (HRB 21850)