The aircraft has still not been removed from there and operations on the main runway remain suspended.
According to airport sources, NOTAM (notice to airmen) has been extended till 6 am tomorrow, which means flights will continue to operate from the secondary runway, which has a limited aircraft handling capacity.
NOTAM contains information concerning the establishment, condition, or change in any facility, service or procedure, among others, in airspace management.
"The process of removing the stranded aircraft from the runway is going on for the last 22 hours with the help of Air India but to no avail," the source said.
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Till 5 pm today, 63 flights of the Jet Airways, eight of IndiGo, two of SpiceJet and one of GoAir were cancelled, a statement from the airport said.
As many 56 flights were diverted to nearby airports till this morning.
"The process of removing the aircraft has been affected due to continuous rains, resulting in soft soil in the area. NOTAM for closure of the main runway is being extended up to 6 am tomorrow," a Mumbai International Airport Limited (MIAL) spokesperson said.
Minister of State for Civil Aviation Jayant Sinha tweeted, "#AI team assisting #RescueOperation in removal of #SpiceJet acft from #BOM runway, the only airline in India to offer this type of facility (sic)."
A SpiceJet plane, carrying 183 passengers from Varanasi, skidded off the runway while landing at the Chhatrapati Shivaji International Airport here at around 10 pm yesterday amid heavy rains and got stuck in the mud.
The Mumbai airport, which is the second busiest in the country, has two crossing runways -- 09/27 (the main) and 14/32 (the secondary runway).
While the primary runway can handle up to 48 arrivals and departures per hour, the secondary runway has a capacity of 35 movements per hour. Overall, there are 930 flight arrivals and departures at the Mumbai airport every day.
Following the closure of the main runway and subsequent cancellation of flights, several domestic airlines decided to waive airfare penalties for passengers travelling to or from Mumbai for a particular period.