High Road to China has a lot going for it. Great cast: Tom Selleck, Bess Armstrong, Brian Blessed, Wilford Brimley, Jack Weston, Robert Morley. Great period setting: 1920s Asia. Great action in the air (biplanes!) and on the ground.
Tom Selleck is a crochety WWI flying ace who's hired to help Armstrong locate her father in China before he's declared legally dead. If that happens, she'll lose her inheritance. Armstrong's a flapper with a mind of her own. She's also a flyer, so she and Selleck take off in twin biplanes and get into all sorts of scrapes. Want to bet they'll fall for each other?
It all ought to work better than it does. All the ingredients are there, but it never quite takes off. The aerial sequences are great. In fact all the action is. Armstrong and Selleck look great and their repartee is dandy. The story's fine. The pacing is a little off, though. It wants to be Raiders of the Lost Ark, but it's more Kingdom of the Crystal Skull. Worth a look, but not essential.