FILE - U.S. Defense Secretary James Mattis (center) is greeted by military dignitaries as he arrives at Al Udeid Air Base in Doha, Qatar April 21, 2017.
FILE - U.S. Defense Secretary James Mattis (center) is greeted by military dignitaries as he arrives at Al Udeid Air Base in Doha, Qatar April 21, 2017.

DUBAI, UNITED ARAB EMIRATES - A deal between the United States and Qatar for F-15 fighter jets and a visit to Doha by two American warships Thursday showed the vital military links Washington maintains with a country now in a dispute with several other Arab nations.
Qatar remains the home of some 10,000 American troops at a major U.S. military base in the Mideast. So far, the dispute between Doha and nations led by Saudi Arabia has yet to shake that partnership, though cracks are showing in responses from President Donald Trump and his administration.
Meanwhile, the United Nations agency overseeing global air travel has acknowledged receiving complaints from Qatar about other nations cutting off flying routes for its long-haul state carrier, Qatar Airways. Those cuts have seen global air travel disrupted and threatened the airline's revenues.

$12 billion deal
In Washington, Qatari Defense Minister Khalid bin Mohammed al-Attiyah met Wednesday with U.S. Defense Secretary Jim Mattis and signed a deal for F-15 fighter jets it described as being worth $12 billion.
“Qatar and the United States have solidified their military cooperation by having fought together side by side for many years now in an effort to eradicate terrorism and promote a future of dignity and prosperity,” al-Attiyah said in a statement. 
The U.S. military announced a similar $21.1 billion deal in November for 72 F-15QA fighter jets for Qatar in the waning days of the Obama administration. It wasn't immediately clear if the two deals were one in the same. Qatari officials did not immediately respond to questions Thursday, though a State Department official connected the two sales. 
Mattis formerly oversaw the U.S. military's Central Command, whose forward operating base is at the vast al-Udeid Air Base in Qatar. That base serves an important role in managing the fight against the Islamic State group in Iraq and Syria, as well as war in Afghanistan. 
The State Department official, speaking to The Associated Press on condition of anonymity to discuss an internal matter publicly, said the sale will take years to complete.

Two port visits
Meanwhile, the USS Chinook, a coastal patrol ship, and U.S. Coast Guard Cutter Baranof both were in Doha Thursday, said Cmdr. Bill Urban of the U.S. Navy's Bahrain-based 5th Fleet. He called the trip a “routine port visit,” though Qatar's state-run news agency described the presence as being part of a “joint exercise” with the Qatari navy. 
“U.S. 5th Fleet ships conduct similar port visits throughout the region as part of our normal operations,” Urban told the AP. 
The crisis between Qatar and its Arab neighbors, all U.S. allies, has put America in a delicate situation. Mattis has described Qatar as “moving in the right direction,” while U.S. Secretary of State Rex Tillerson said called for Arab Gulf nations to remain united. 
Trump, meanwhile, repeatedly has accused Qatar of funding terrorist groups, one of the main allegations levied by Saudi Arabia, the United Arab Emirates, Egypt and Bahrain when they initially cut diplomatic ties June 5.

American ally
Qatar long has been trying to secure its relations with the U.S., whether through hosting the American military base or an office for the Taliban, said David B. Roberts, an assistant professor at King's College London who recently wrote the book Qatar: Securing the Global Ambitions of a City-State.
The recent mixed message from the Trump administration, however, has it working even harder, he said. 
“Qatar long has wanted to make itself a particularly important ally for America where it can,” Roberts said. “It has been a bit of a pain at times in other things ... but the American angle has often been very important.” 
The crisis has seen Saudi Arabia cut off its land border with Qatar, the host of the 2022 FIFA World Cup. 
After an initial run on grocery stores by nervous residents, Qatar has organized dairy shipments from Turkey while Shiite power Iran also has begun shipping in food. Qatar's ties with Iran, with whom it shares a major offshore natural gas field, is another criticism of the Arab countries. 
Doha also has begun running cargo shipments from ports in Oman after seeing its sea routes to the UAE's major ports cut off. But its cutoff air travel routes remain problematic. 

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