LATAM is a fairly new airline that was created in a merger between Chile's LAN and Brazil's TAM Airlines in 2012. LATAM has an extensive route network in South America and fly to several cities in the U.S.
Points Expiration: Points from LATAM flight are valid for 36 months from the date of your last trip on LATAM. Points earned with other OneWorld or partner airlines are "valid for 3 calendar years, expiring on December 31st of the third calendar year after their attainment."
More Information: LATAM's Wikipedia
Earning LATAM Miles
LATAM Flights: You earn based on the price of your flight (minus taxes and fees) multiplied by your elite number. (Base Member (5x), Gold (6x), Platinum (9x), Black (10x), Black Signature (11x))(e.g. a $600 flight with $100 of that amount being taxes, would earn a base member 2,500 LATAM points (5 x 5 x $500))
OneWorld And Alaska Flights: It depends on the fare class, but you can view the chart online.
Credit Cards: LATAM partners with U.S. Bank for their credit cards. However, the sign up bonus is usually quite low (around 20,000 points), but if you spend $15,000 on the Visa Signature card, you get 3 upgrade certificates.
Buying Points: You can buy points for two cents each when selecting "Use LATAM Points" on their homepage.
Using LATAM Miles
LATAM Points Calculator: You can enter your departure and destination city via their calculator to see how many points are required. The calculator only works for LATAM flights. Additionally, the numbers from the calculator are only the starting prices, so be sure to check the actual number via their homepage when you enter your dates, route, and check the box "Use you LATAM Pass Points."
OneWorld and Partners: Award chart is below. You can redeem points on their OneWorld Alliance Partners: American Airlines, British Airways, Cathay Pacific, Finnair, Iberia, Japan Airlines, Malaysia, Qantas, Qatar, Royal Jordanian, S7, and SriLankan. You can also redeem points on AeroMexico and Alaska Airlines.
Routing Rules: Round-trips only. Open-jaw tickets are allowed as long as both the first and last city are in the same region. One stopover is allowed on LATAM flights. Stopovers on partners depend on that airline's policy. (I am unable to locate specific rules for each partner)
Award Fees: Call center fee ($25); changes and refunds depend on distance and time before departure. For a long flight within 21 days, there is a $150 change fee and $300 refund fee. For long flight more than 21 days, there is a $75 change fee and $125 refund fee.
Phone Number: 866-435-9526
OneWorld and Partner Award Chart