Narrative:

Flight [to] mmun; nosat 1B arrival. Czm as alternate. I was pilot flying. Held at letis on the arrival for approximately 20 minutes due to weather in mmun area. Cleared to airport for ILS 12L via radar vectors to the north for weather avoidance. Encountered moderate turbulence during vectoring while avoiding scattered cells. Vectored near the FAF to avoid weather for the ILS. In visual conditions but due to the vectoring altitudes; I was unable to get the airplane fully configured by 1;000; so I initiated a go-around. During subsequent vectors to the southwest for another approach to 12L we encountered moderate turbulence again. The flight attendants (flight attendant's) called to inform us they had a pregnant woman who was unconscious and needed immediate medical assistance - requesting paramedics.I told the captain that I did not want to attempt another approach under these conditions and that we should divert to czm. The captain agreed and asked for vectors clear of weather and to divert to czm. During the vectoring; which took us out over the water to the east to the airport and clear of the weather; ATC informed us that the airport was now landing to the northwest on runway 30L and asked if we wanted to fly the RNAV to 30L. The approach corridor to the airport was clear of weather / turbulence and the winds were from the northwest; so we requested the approach for 30L. On the approach; we broke out at approximately 1;000 with good visibility; no precipitation and slowed to follow a lear jet ahead of us. Captain asked for landing clearance and was told to continue due to landing traffic. At approximately 500 feet; captain again asked for landing clearance and tower instructed a go-around. Captain responded that we were unable. The captain instructed me - if the traffic clears the runway; we are landing.at approximately 300 feet; we could both see the lear jet clearing the runway. Tower instructing again for a go-around and captain stated unable; we must land. The captain said the traffic is clear of the runway - I agreed. He gave me a direct order - do not go-around - land the airplane! The traffic had cleared the runway prior to our landing. I assume that the captain based his decision on several factors:• fuel state• known weather / turbulence in missed approach path• unconscious pregnant woman• previous approach / missed approach into weather• I believe landing was a reasonable exercise of captain's authority.cause: I believe that ATC did not space us correctly with the lear during a switch to a non-normal traffic flow into mmun. The lear was very slow to clear the runway. Suggestions:1. divert early2. [identify as an] priority to ATC

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Original NASA ASRS Text

Title: B737 flight crew reported exercising Captain's authority during landing after tower instructed a go-around.

Narrative: Flight [to] MMUN; NOSAT 1B arrival. CZM as Alternate. I was pilot flying. Held at LETIS on the arrival for approximately 20 minutes due to weather in MMUN area. Cleared to airport for ILS 12L via Radar Vectors to the North for Weather avoidance. Encountered moderate turbulence during vectoring while avoiding scattered cells. Vectored near the FAF to avoid weather for the ILS. In visual conditions but due to the vectoring altitudes; I was unable to get the airplane fully configured by 1;000; so I initiated a Go-Around. During subsequent vectors to the southwest for another approach to 12L we encountered moderate turbulence again. The Flight Attendants (FA's) called to inform us they had a Pregnant woman who was unconscious and needed immediate medical assistance - requesting Paramedics.I told the Captain that I did not want to attempt another approach under these conditions and that we should divert to CZM. The Captain agreed and asked for vectors clear of weather and to divert to CZM. During the vectoring; which took us out over the water to the East to the airport and clear of the weather; ATC informed us that the airport was now landing to the northwest on Runway 30L and asked if we wanted to fly the RNAV to 30L. The approach corridor to the airport was clear of weather / turbulence and the winds were from the northwest; so we requested the approach for 30L. On the approach; we broke out at approximately 1;000 with good visibility; no precipitation and slowed to follow a Lear Jet ahead of us. Captain asked for landing clearance and was told to continue due to landing traffic. At approximately 500 feet; Captain again asked for landing clearance and Tower instructed a Go-Around. Captain responded that we were unable. The Captain instructed me - if the traffic clears the runway; we are landing.At approximately 300 feet; we could both see the Lear Jet clearing the runway. Tower instructing again for a Go-Around and Captain stated unable; we must land. The Captain said the traffic is clear of the runway - I agreed. He gave me a direct order - Do not Go-Around - Land the Airplane! The traffic had cleared the runway prior to our landing. I assume that the Captain based his decision on several factors:• Fuel State• Known weather / turbulence in Missed Approach path• Unconscious pregnant woman• Previous approach / missed approach into weather• I believe Landing was a reasonable exercise of Captain's Authority.Cause: I believe that ATC did not space us correctly with the Lear during a switch to a non-normal traffic flow into MMUN. The Lear was very slow to clear the runway. Suggestions:1. Divert early2. [Identify as an] priority to ATC

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.