Heat oven to 350°F. Arrange pancetta in asingle layer on a large rimmed baking sheet.
Bake until brown and crisp, 20–25 minutes.(Alternatively, place pancetta on foldedlayers of paper towels on a microwave-proofplate and microwave on high until brownand crisp, about 5 minutes.)
Let pancettastand until cool enough to handle, thenbreak into bite-size pieces.
Meanwhile, cook pasta in a medium potof boiling salted water, stirring occasionally,until al dente.
Drain pasta; run under coldwater to cool.
Drain and set aside.
Whisk oil and vinegar in a large bowl.
Add half of pancetta, cooked pasta, melon,half of mint, scallion, and red pepper flakes.Toss to coat. Season to taste with salt andpepper.
Transfer to a serving dish andsprinkle remaining pancetta and mint over.