Originally Posted by
xliioper
It's just a website front-end update (which they had been testing out on people for a very long time). Very much doubt it involved actual changes to the "booking system". You can still get to the old advanced search page with option to specify fare class at
https://www.delta.com/flight-search/book-a-flight
If OP can't see it in the App, it sounds like it hasn't actually ticketed yet. Note that there can sometimes be SMTP MTA (message transfer agent) delays with email. The Received: headers in the raw email message will indicate if there were possibly queuing delays in delivering the email. In the example below, it only took two seconds to send from Delta to my Yahoo account
Received: from 127.0.0.1 (EHLO mta857.e.delta.com) (63.232.236.83)
by mta4203.mail.gq1.yahoo.com with SMTPS; Mon, 18 Feb 2019 17:32:44 +0000
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Received: (qmail 19074 invoked by uid 108 (TLS)); Mon, 18 Feb 2019 17:32:42 -0000
I checked all the headers and it looks like it was sent at 18:22:54 (Mountain Daylight Savings Time) and arrived to me at 20:22:57 (Eastern Daylight Savings Time) for a grand total of 3 seconds. The flight was booked around 14:00 EDT. What was Delta doing for those 6 hours and 22 minutes?