With the overall director of Los Angeles International Airport committing suicide, his two underlings spar amongst themselves for his former position and title by attempting to prove they can handle the pressures of operating one of the world's largest and busiest aviation gateways.
When a coffin arriving as baggage on an in-bound flight is discovered to contain a living person, Harley and Roger with the help of Henry, Betty and Nick locate the missing corpse/stow-away. Elsewhere, Tony tries to secure twelve seats to Albany for a little league team trying to make their first national championship, while the airport staff tests out new tactics to deal with the airports bird problem.
On his way home from a conference in Sacramento with a quick jaunt to Las Vegas, Roger begins to suspect his plane might be in trouble when a minor electrical surge sets off the cabin call lights. Using his status as LAX tower supervisor and experience as a flight engineer, he attempts to gain control of the situation, only to discover the plane is experiencing a massive power failure as the control instruments slowly start to fail. In the LAX control tower Harley attempts to guide the distressed plane in for a safe landing while Tony keeps Roger's wife comforted in the terminal.
When LAX receives a word from Homeland Security that a credible threat has put the airport on high alert, Harley and Roger debate over whether to notify the public or continue to keep the news a secret. Tensions build when passengers are faced with longer lines due to extra security, and Roger puts his relationship with his daughter in jeopardy when he refuses to let her fly -- forcing her to miss a very important recital. Meanwhile, Tony must take care of a senile old woman who has been left stranded at the airport by her son who can no longer bear the burden of taking care of her.
Amani, a recently divorced Arab-American woman, flees her country with her son when her husband claims full custody of their child. Upon landing in Los Angeles, the boy is promptly abducted by Amani's mother-in-law who has followed the pair to the U.S. -- forcing Roger and Harley to sort through the thorny legal issues of custody. However, an indebted Harley is emotionally influenced since Amani is one of her oldest friends. Meanwhile, Roger develops mysterious chest and arm pain and Tony is forced to oversee a new but unqualified employee who is the daughter of one of the world's biggest airline executives.
It's a stressful day at LAX when Alonso, with Federal Traffic and Safety, arrives for a surprise inspection of the airport. As Harley and Roger try to make the day run smoothly, their first problem arises when a flight from Shanghai to New York must make an emergency landing. Elsewhere, Nick is dealing with an Uzbekistani man who seeks asylum, but is suspected of being a terrorist, while the airport is under siege from paparazzi swarming in anticipation of Prince William's arrival.
When a disgruntled air traffic controller on suspension decides to make his return to the airport ahead of schedule with a gun, Harley is held hostage along with the entire tower crew. Hoping to secure the release of the hostages, Roger trades his life for theirs only to have both airport supervisors held at gunpoint in the tower, while Henry tries to talk down the gunman. Meanwhile, Wally's sudden attack of an international passenger has his future at the airport in jeopardy with Betty fearful that she may lose her longtime partner.
Harley and Roger place the airport under security lockdown as they baby-sit a group of FBI agents and their star witness on her way to testify in federal court against her drug-dealing boyfriend. However, when the witness disappears from her flight shortly after leaving the gate, the LAX co-chiefs race to find the missing girl before she can be silenced. Meanwhile, Caitlin attempts to solve the wedding woes of a traveling bride and her fiancé after her dress is destroyed in a baggage mishap and Tony attempts to keep an elderly birthday boy from flying to Vegas with his oxygen tank.
In the midst of the busiest travel day of the year, Roger attempts to keep passengers and planes moving while avoiding his intoxicated ex-wife who claims to be in town to spend Thanksgiving with her daughter. Elsewhere, Harley reunites with her little sister in the hopes of finally reconnecting with her family for the holidays. However, when her sister reveals that her folks are also coming to town, Harley has second thoughts about the reunion. Meanwhile, Tony and Henry deal with the sudden bankruptcy of a major airline that leaves both passengers and stewardesses stranded in the terminal.
When a fugitive Santa Claus wanted for armed robbery leads police on a high speed chase concluding at LAX, Harley and Roger work with the LAPD to track down Chris Cringle amongst the departing passengers. However, when Santa ditched his red coat and white beard, the airport chiefs have to outsmart this fugitive to stop him from boarding an outbound flight. Meanwhile, Harley faces the frightening proposition of moving in with her boyfriend and Roger attempts to save his marriage after falling off the wagon by placing a large sports bet and losing big.
An African political activist who was wrongly convicted of murder arrives at LAX to board a flight which will return him home for execution. As protesters try to prevent his departure, the airport becomes the sight of political unrest forcing Harley and Roger to keep the peace. However, when Roger's city council aspiration prompt him to make a bold move, the two airport chiefs stand on opposite sides of this political powder keg. Meanwhile, Nick must confront a past decision when a former passenger returns begging for his help.
An alarming announcement that an inbound plane has been hijacked sets Harley and Roger into action. Shortly after, even though the pilot informs the pair that the previous cry for help was a false alarm, Harley and Roger are forced to follow procedure and act as if the hijacking is taking place. To top off the already highly volatile situation, Roger must also contend with his impending divorce. Elsewhere, Caitlin and Tony's affections grow stronger. The two send each other mixed signals when Caitlin tries to hide their relationship and jealousy rears its ugly head when Tony's emotions get the better of him.
In the wake of his second marital affair with his wife's divorce attorney, Roger attempts to regain control of his life and prove he can be a good father and husband. However, the arrival of a senator's daughter from Amsterdam complicates his life plan when he discovers she brought a little illegal souvenir home. Meanwhile, Harley mulls over an offer to run Dallas International Airport and Tony tries to regain Caitlin's trust after his alleged romantic slip. Elsewhere, Betty helps Nick toast his pending nuptials with a few drinks and some romantic confessions.