Brussels Airport is gradually regaining its footing with flights gradually increasing, nearly two weeks after suicide bombers blew themselves up in its departure hall, killing 16 people and injuring dozens. The airport was immediately closed to all passenger and cargo traffic after the attacks of 22 March. All-cargo flights resumed after a number of days but passenger services remained closed while investigations, safety and security assessments were made.

The airport officially reopened with an “emotional” first flight on Sunday, with Brussels Airport chief executive, Arnaud Feist describing the partial reopening as a sign of hope after the horror of the attack.

“In the days that followed, I have also seen much courage, pride for Brussels airport and persistence is being shown by everybody,” Feist said in a statement. “That makes me very hopeful for the future of our airport and convinces me that we will emerge stronger than ever from this crisis.”

Passengers and their luggage are now being processed through new check-in procedures, before entering the airport, in temporary structures. Airport authorities says traffic will slowly increase over the coming days and should be fully restored by July, in time for the summer vacation season.

Brussels Airlines, which operates its main hub out of the airport, began with three flights to European destinations: Faro, Athens and Turin and expanded today with long haul flights and additional European flights. Due to infrastructural limitations, only a limited amount of flights can be operated out of Brussels Airport.

As such, Brussels Airlines said it will continue to operate part of its flight schedule from the regional airports of Liège and Antwerp. Some long haul flights continue to be operated from Frankfurt and Zurich. Whenever possible, these flights will gradually be offered from Brussels Airport again, it added.

Aside from Belgium’s regional airports, many flights have also been rerouted to nearby hubs such as Amsterdam and Paris, with high-speed trains to and from Brussels packed to capacity.

And despite the reopening some carriers have opted to cancel services to Brussels, with Delta Airlines saying on Saturday it was suspending service between its Atlanta hub and Brussels until March 2017, “due to the continued uncertainty surrounding the airport’s re-opening and weakening demand.”

It added that it still plans to resume service between New York’s John F. Kennedy airport and Brussels, “once the airport provides clearance for international operations.”