( CNN ) -- Inspectors have found `` nothing unusual '' in the rest of Southwest Airlines ' fleet of 737-300s after a football-sized hole in one of the jets forced an emergency landing , an airline spokeswoman said Tuesday . The breach in the aircraft 's fuselage caused a loss of cabin pressure . No passengers were injured . The airline inspected its roughly 200 Boeing 737-300s overnight following the incident that forced Southwest Flight 2294 to make an emergency landing in Charleston , West Virginia . A sudden drop in cabin pressure caused the jet 's oxygen masks to deploy , but there were no injuries among the 126 passengers or the five-member crew . Marilee McInnis , a Southwest spokeswoman , said the jets were inspected during non-operational hours overnight , and the cause of the incident remained unknown Tuesday morning . The airline is working closely with the National Transportation Safety Board to investigate the matter , she said . Flight 2294 was at 34,000 feet , en route from Nashville , Tennessee , to Baltimore , Maryland , when the incident happened , McInnis said . See map of flight path » . `` About 45 minutes into the flight , there was a loud pop . No one really knew what it was , '' passenger Steve Hall told CNN Radio . Watch as passenger describes watching the hole form » . The plane landed in Charleston at 5:10 p.m. after the crew reported the sudden drop in cabin pressure , which caused the jet 's oxygen masks to deploy . `` We were seated about two rows back from the wing , and four rows back you heard this loud rush and your ears popped , and you could tell that part of the inside was trying to pull out , '' passenger Sheryl Bryant told CNN affiliate WBAL-TV upon arriving in Baltimore aboard a replacement plane . `` And it was crazy -- the oxygen masks dropped , '' she continued . She put her mask on her face , then helped her 4- and 6-year-old children with theirs , she said . Bryant tried to stay calm and reassure her children , she said . Watch Bryant 's account of acting brave » . `` My kids and I , we prayed , and then we said , you know , life will be fine , '' she said . Bryant praised the flight crew and ground personnel for keeping passengers informed and for giving clear instructions . `` We have a tremendous talent represented in the pilots and the flight crew , '' another passenger , Pastor Alvin Kibble , told WBAL-TV . `` I think we need to value them far more than perhaps what we do . It 's very easy for us to begin to take things for granted . '' The damaged aircraft was still parked at Charleston 's Yeager Airport on Tuesday , when NTSB officials arrived to inspect the plane , airport spokesman Brian Belcher said . A complete inspection could take one to two days , and investigators are expected to interview the passengers and crew as well , he said . The airline is `` doing things '' for the affected passengers on Monday 's flight , but McInnis would not say whether they would receive refunds . Both the Federal Aviation Administration and the National Transportation Safety Board are investigating the incident , FAA spokeswoman Holly Baker said . `` There is no responsible way to speculate as to a cause at this point , '' Southwest said in a statement Monday night . `` We have safety procedures in place , and they were followed in this instance to get all passengers and crew safely on the ground , '' the airline said . `` Reports we have are that our passengers were calm and that our pilots and flight attendants did a great job getting the aircraft on the ground safely . '' CNN 's Shawn Nottingham and Stephanie Gallman contributed to this report .
NEW : Southwest inspects all its 737-300s aircraft after four develops hole midflight . Passengers describe ordeal , praise professionalism of flight crew . West Virginia -bound Southwest Flight jet makes emergency landing in Baltimore . Football-sized hole in fuselage causes cabin to depressurize , oxygen masks to drop .