"America's support for Qatar is deep-rooted and not easily influenced by political changes", a Qatari official said. Al Udeid Air Base is home to more than 11,000 United States and coalition troops.
The Pentagon said in a statement that the deal "will give Qatar a state-of-the-art capability and increase security cooperation and interoperability between the United States and Qatar".
The F-15 agreement would lead to "closer strategic collaboration in our fight to counter violent extremism and promote peace and stability in our region and beyond", according to the defence ministry. "Our expectation from King Salman is that he be the leader in solving this problem", Cavusoglu said at a joint news conference with his Tunisian counterpart.
After the Gulf countries moved against Qatar, US Secretary of State Rex Tillerson initially declined to take sides in the crisis, but his cautious stance was overshadowed nearly immediately by Mr Trump, who sent a series of tweets that appeared to take credit for and to praise the decision.
A ship decks at Hamad port in Doha Qatar
Just in November past year, US has approved a possible sale of F-15QA aircraft to Qatar for $21.1 billion where it can get upto 72 fighter aircrafts.
"This is of course proof that USA institutions are with us but we have never doubted that", Reuters news agency quoted a Qatari official in Doha as saying.
Turkish Foreign Minister Mevlut Cavusoglu, on a Gulf tour trying to help broker an end to the crisis, defended the deal.
The Turkish chief diplomat held talks with Qatar's emir and foreign minister on Wednesday and plans to visit Saudi Arabia.
Qatar, for its part, has denied the accusations, calling the moves to diplomatically isolate it "unjustified". "Resolving the crisis is not through taking [boycott] decisions but through dialogue", Cavusoglu said.
Sanders 'sickened' by congressional shooter 'who apparently volunteered for my campaign'
Hodgkinson, who worked as a building inspector, volunteered for the Mr Sanders' unsuccessful presidential campaign past year . But CNN's Dana Bash reported that the shooting was deliberate and not a random act. "It's Time to Destroy Trump & Co".