I rush into Miami International Airport at 3:30 p.m. on a rainy Thursday, worried I’ll miss my 4:15 p.m. flight to Philadelphia. Without a checked bag, security is my only hurdle, and I dread a long line that could cause me to miss boarding. Luckily, I remember my CLEAR membership, which...

I rush into Miami International Airport at 3:30 p.m. on a rainy Thursday, worried I’ll miss my 4:15 p.m. flight to Phi...