Wings: Time Out of War (1977)

S01E07 - July 1915: Following his accident, Alan has to spend three weeks acting as Charles Gaylion's observer. His friendship with Gaylion causes unrest among the NCOs because of the difference in their rank, and becomes a concern for Triggers. TVTime.

The Hardy Boys: The Mystery of the Flying Courier (1977)

S01E09 - Frank thinks he sees a girl whom he knew years ago who went missing, whose parents hired his father to locate but couldn't. When he tries to talk to her she claims that she is someone else. So he and Joe try to follow her but someone tries to kill them so they think she's mixed up in something. IMDb.

Wings: Over the Top (1977)

S01E06 - June 1915: With hot weather and a break in the bombardment, Alan goes swimming and Morgan experiments with fitting bombs with parachutes. The RFC are summoned to assist in a new initiative, and Gaylion gets a taste of the horrors of life in the trenches when his plane is forced down and he must wait overnight for the arrival of a replacement propellor. TVTime.

The Hardy Boys: A Haunting We Will Go (1977)

S01E08 - Nancy revives a play in a theater that is supposed to be haunted. Actors from the original cast return to do the play. They seem to have intentions rather than the play, which makes Nancy suspicious and determined to discover the secret of the phantom. IMDb.

Wings: Speaking From Experience (1977)

S01E05 - June 1915: On his arrival at ‘C’ Flight, Triggers' forthright manner and unusual ideas quickly make an impression. Seeing the inadequacies of the planes, Triggers encourages the pilots and NCOs to put forward ideas for improvement. TVTime.

The Hardy Boys: The Flickering Torch Mystery (1977)

S01E07 - While investigating the disappearance of a sound technician, the Hardy Boys find a link to a rock band he was working for. IMDb.

Wings: Business as Usual (1977)

S01E04 - June 1915: ‘C’ Flight is ordered to locate a German Howitzer so the artillery can attack it. Alan volunteers, but Captain Dornish insists on carrying out the task himself, taking a newly-arrived observer, Guthrie, on the mission. TVTime.

The Hardy Boys: The Secret of the Whispering Walls (1977)

S01E06 - Nancy's aunts are going to sell their property. The day before the deal is reality, a burglar steals all documents. Nancy goes to her aunts to explain. One aunt shows very discomfort, and speaks about voices in the walls. IMDb.

Wings: Business as Usual (1977)

S01E04 - June 1915: 'C' Flight is ordered to locate a German Howitzer so the artillery can attack it.

The Hardy Boys: The Disappearing Floor (1977)

S01E05 - While investigating the disappearance of a missing scientist, the boys begin to doubt their senses when they discover an isolated estate loaded with bizarre illusions. IMDb.

Wings: Welcome to France (1977)

S01E03 - May 1915: Alan arrives at ‘C’ Flight in St Marie, France and faces resentment from some officers because of to his background (‘A blacksmith? We are getting desperate for chaps’), but quickly wins over his CO, Captain Dornish, and is delighted to be reunited with his friend Charles. Following the death of another NCO on the day he arrives, Alan, initially sent out as a "spare" pilot, is sent on a mission to range for the artillery, in the company of Lt Richard Bravington, an experienced Observer officer. TVTime.

The Hardy Boys: The Mystery of the Diamond Triangle (1977)

S01E04 - While in the air, Nancy sees a car go off the road, and reports it. Everyone says the road is not been used since the bridge went down. Searching for that special car leads her to a young mechanic, but as they open the barn-doors? IMDb.

The Hardy Boys: The Mystery of Witches' Hollow (1977)

S01E03 - On a trip to a retired police captain's country home, the boys and their friends find him missing and themselves plagued with mysteriously threatening happenings that seem related to an old local legend. IMDb.

Wings: Never Turn Back (1977)

S01E02 - April 1915: Alan Farmer's training is well-advanced, and he shares accommodation with Sergeant MacIver, who already has experience of service with the RFC in France. TV Time.

The Hardy Boys: The Mystery of Pirate's Cove (1977)

S01E02 - Nancy suspects something is amiss when an abandoned lighthouse mysteriously activates. IMDb.

The Hardy Boys: The Mystery of the Haunted House (1977)

S01E01 - Joe and Frank Hardy, suspicious of their father's "fishing trip," follow him and become involved in the search for an amnesiac ex-soldier being chased by killers for some secret he knows. They end up at a club called the Haunted House that has mazes, trapdoors, and secret passageways. Wikipedia.