Until November 9, 2016, the Delta Gold card is offering 50,000 bonus Delta miles and a $50 statement credit after you spend $2,000 in your first three months.

Until November 9, 2016, the Delta Platinum is offering 70,000 bonus miles, 10,000 status miles (MQMs), and a $100 statement credit after you spend $5,000 in your first three months.

Credit card links have been removed from posts and added to the menu bar at the top of every page of MileValue under the heading Top Travel Credit Cards.

This is the largest bonus I’ve seen on

The Citi Prestige® Card comes with 40,000 bonus ThankYou Points after $4,000 in purchases made with your card in the first 3 months the account is open.
Quick Facts

Sign Up Bonus: 40,000 ThankYou Points after $4,000 in spending
Category Bonuses: 3x on air travel and hotels, 2x on restaurants and entertainment
Air Travel Credit:  $250 statement credit per calendar year ($500 during first year of cardmembership)
Global Entry: $100 application fee credit
Lounge access: Priority Pass lounges worldwide for you and two guests
Free hotel nights: Get your 4th night free (including taxes) on all

Until July 6, 2016, the Delta Gold card is offering 50,000 bonus Delta miles and a $50 statement credit after you spend $2,000 in your first three months.

Until July 6, 2016, the Delta Platinum is offering 60,000 bonus miles, 10,000 status miles (MQMs), and a $100 statement credit after you spend $2,000 in your first three months.

This is the largest bonus I've seen on the Platinum card.

The Alaska Airlines card from Bank of America now offers 30,000 bonus Alaska miles after you spend $1,000 on purchases in your first 90 days from account opening.

The previous public offer had been 25,000 miles for a long time with frequent 30,000 mile offers and an occasional 40,000 mile offer, but Alaska Airlines announced its plan to go to a 30,000 mile bonus this spring in a February stock market filing.
Quick Facts

Sign Up Bonus: 30,000 Alaska miles after $1,000 in spending in the first 90 days
Category Bonuses: 3

Right now the Delta Gold and Platinum cards both have limited time offers that expire June 30 (Tuesday).

The Platinum Delta card offers 60,000 bonus SkyMiles and 10,000 MQMs, Delta's status counting miles, after spending $2,000 in the first three months.

The personal and business versions of the Gold Delta card each offer 50,000 bonus SkyMiles after spending $2,000 in the first three months.

Contents of this article:

Offer details
My valuation of the offer
Are you eligible for the bonus?
Best uses of SkyMiles

Offer Details
The Gold cards are the "standard" airline

The offer has changed.