I have always admired Stripe's website. [1] Their UI is so elegant to me.<p>[1]: <a href="https://stripe.com" rel="nofollow">https://stripe.com</a>
AmEx Travel. Seriously. Only booking site I'm using from now on. Caveat of course that membership is required.<p><a href="https://travel.americanexpress.com" rel="nofollow">https://travel.americanexpress.com</a>