April is the startup date as that is when the Screening and new Terminal and the Runway widening will finish,the Runway rebuild and extension was completed but now the runway has to be widened to 45m hence the Notam for AD closure at night with the widening being done in sections at night as the major work was to keep the Airport open.
If thats the case then you can expect to welcome Jetstar too upon works completion. Or at least as a replacement for the Q400.