The repair work which is on going at the Nnamdi Azikiwe International Airport, Abuja would only be done at night starting from next month in order not to disrupt flight operations.

This is according to a statement from the office of the Vice President.

"After the Abuja airport re-opens for operations on April 19, upgrade works on the runway will continue for another 18 weeks. This second phase of upgrade works will be carried out at night, with no disruption to flight schedules," the statement said.

The runway repairs will continue for an 18-week period once it re-opens next month.

However, the Nigerian capital's airport remains closed for the first phase of repairs to its dilapidated runway, and airlines will continue to be rerouted to Kaduna airport.

But analysts say the cutting of direct flights to Abuja, an important business hub as well as Nigeria's political nerve centre, has raised economic and security concerns.

Airlines including British Airways, Lufthansa and South African Airways have refused to fly into Kaduna due to unresolved matters.