"More than a Woman" and "I Care 4 U" were released as posthumous singles and peaked within the top 25 of the Billboard Hot 100. The album was certified double Platinum by the RIAA and sold 2.6 million copies in the United States. "More than a Woman" reached number one on the UK singles chart making Aaliyah the first female deceased artist to reach number one on the UK singles chart. "More than a Woman" was replaced by George Harrison's "My Sweet Lord" which is the only time in the UK singles chart's history where a dead artist has replaced another dead artist at number one. In July 2001, she allowed MTV's show Diary behind-the-scenes access to her life and stated: "I am truly blessed to wake up every morning to do something that I love; there is nothing better than that." She continued, "Everything is worth it – the hard work, the times when you're tired, the times when you are a bit sad. In the end, it's all worth it because it really makes me happy. I wouldn't trade it for anything else in the world. I've got good friends, a beautiful family and I've got a career. I thank God for his blessings every single chance I get."
In November 2001, Ronald Isley stated that Aaliyah and the Isley Brothers had discussed a collaboration prior to her death. She had previously covered the Isley Brothers' single "At Your Best (You Are Love)". Prior to her death, she expressed the possibility of recording songs for the Queen of The Damned soundtrack and welcomed the possibility of collaborating with Jonathan Davis. By 2001, Aaliyah had enjoyed her now seven-year career and felt a sense of accomplishment. "This is what I always wanted," she said of her career in Vibe magazine. "I breathe to perform, to entertain, I can't imagine myself doing anything else. I'm just a really happy girl right now. I honestly love every aspect of this business. I really do. I feel very fulfilled and complete."
In her spare time, she was mostly a homebody, which dated back to her younger years, but on occasion went out and played laser tag. She reasoned this was due to her liking "the simple things in life". Despite having a prosperous career that allowed her to purchase the vehicle she wanted, Aaliyah revealed during her final interview on August 21, 2001, on 106 & Park, that she had never owned a car because she lived in New York City and could hire a car or driver on a regular basis.
Aaliyah was known to have usually been accompanied by members of her family and the "Rock the Boat" filming was credited by Rashad Haughton as being the first and only time her family was not present. In October 2001, Rashad stated: "It really boggles everyone [that] from Day One, every single video she ever shot there's always been myself or my mother or my father there. The circumstances surrounding this last video were really strange because my mother had eye surgery and couldn't fly. That really bothered her because she always traveled. My dad had to take care of my mom at that time. And I went to Australia to visit some friends. We really couldn't understand why we weren't there. You ask yourself maybe we could have stopped it. But you can't really answer the question. There's always gonna be that question of why." Her friend Kidada Jones said in the last year of her life her parents had given her more freedom and she had talked about wanting a family. "She wanted to have a family, and we talked about how we couldn't wait to kick back with our babies."
Dash expressed his belief that Aaliyah was the "one" and claimed the pair were not officially engaged, but had spoken about getting married prior to her death. Aaliyah publicly never addressed the relationship between her and Dash as being anything but platonic. In May 2001, she hosted a party for Dash's 30th birthday at a New York City club, where they were spotted together and Dash was seen escorting her to a bathroom. Addressing this, Aaliyah stated that she and Dash were just "very good friends" and chose to "keep it at that" for the time being. Just two weeks before her death, Aaliyah traveled from New Jersey to East Hampton, New York to visit Dash at the summer house he shared with Jay Z.
On August 25, 2001, at 6:50 p.m. (EDT), Aaliyah and the members of the record company boarded a twin-engine Cessna 402 light aircraft at the Marsh Harbour Airport in Abaco Islands, the Bahamas, to travel to the Opa-locka Airport in Florida, after they completed filming the music video for "Rock the Boat". They had a flight scheduled the following day, but with filming finishing early, Aaliyah and her entourage were eager to return to the U.S. and made the decision to leave immediately. The designated airplane was smaller than the Cessna 404 on which they had originally arrived, but the whole party and all of the equipment were accommodated on board. The plane crashed and caught fire shortly after takeoff, about 200 feet (60 m) from the end of the runway.
Aaliyah's private funeral services were held on August 31, 2001, at the Frank E. Campbell Funeral Chapel and at the Church of St. Ignatius Loyola in Manhattan. Her body was set in a silver-plated copper-deposit casket, which was carried in a horse-drawn, glass hearse. An estimated 800 mourners were in attendance at the procession.
Immediately after Aaliyah's death, there was uncertainty over whether the music video for "Rock the Boat" would ever air. It made its world premiere on BET's Access Granted on October 9, 2001. She won two posthumous awards at the American Music Awards of 2002; Favorite Female R&B Artist and Favorite R&B/Soul Album for Aaliyah. Her second and final film, Queen of the Damned, was released in February 2002. Before its release, Aaliyah's brother, Rashad, re-dubbed some of her lines during post-production. It grossed US$15.2 million in its first weekend, ranking number one at the box office. On the first anniversary of Aaliyah's death, a candlelight vigil was held in Times Square; millions of fans observed a moment of silence; and throughout the United States, radio stations played her music in remembrance. In December 2002, a collection of previously unreleased material was released as Aaliyah's first posthumous album, I Care 4 U. A portion of the proceeds was donated to the Aaliyah Memorial Fund, a program that benefits the Revlon UCLA Women's Cancer Research Program and Harlem's Sloan Kettering Cancer Center. It debuted at number three on the Billboard 200, selling 280,000 copies in its first week. The album's lead single, "Miss You", peaked at number three on the Billboard Hot 100 and topped the Hot R&B/Hip-Hop Songs chart. In August of the following year, clothing retailer Christian Dior donated profits from sales in honor of Aaliyah.
Aaliyah has been credited for helping redefine R&B, pop and hip hop in the 1990s, "leaving an indelible imprint on the music industry as a whole." According to Billboard, she revolutionized R&B with her sultry mix of pop, soul and hip hop. In a 2001 review of her eponymous album, Rolling Stone professed that Aaliyah's impact on R&B and pop has been enormous. Steve Huey of AllMusic wrote Aaliyah ranks among the "elite" artists of the R&B genre, as she "played a major role in popularizing the stuttering, futuristic production style that consumed hip-hop and urban soul in the late 1990s." Critic Bruce Britt stated that by combining "schoolgirl charm with urban grit, Aaliyah helped define the teen-oriented sound that has resulted in contemporary pop phenom's like Brandy, Christina Aguilera and Destiny's Child".
Described as one of "R&B's most important artists" during the 1990s, her second studio album, One in a Million, became one of the most influential R&B albums of the decade. Music critic Simon Reynolds cited "Are You That Somebody?" as "the most radical pop single" of 1998. Kelefah Sanneh of The New York Times wrote that rather than being the song's focal point, Aaliyah "knew how to disappear into the music, how to match her voice to the bass line", and consequently "helped change the way popular music sounds; the twitchy, beat-driven songs of Destiny's Child owe a clear debt to 'Are You That Somebody'." Sanneh asserted that by the time of her death in 2001, Aaliyah "had recorded some of the most innovative and influential pop songs of the last five years." Music publication Popdust called Aaliyah an unlikely queen of the underground for her influence on the underground alternative music scene; the publication also mentioned that the forward-thinking music Aaliyah did with Timbaland and the experimental music being made by many underground alternative artists are somewhat cut from the same cloth. While compiling a list of artists that take cues from Aaliyah, MTV Hive mentioned that it's easy to spot her influence on underground movements like dubstep, strains of indie pop, and lo-fi R&B movements. Erika Ramirez, an associate editor of Billboard, said at the time of Aaliyah's career "there weren't many artists using the kind of soft vocals the ways she was using it, and now you see a lot of artists doing that and finding success," her reasoning for Aaliyah's continued influence on current artists. She argued that Aaliyah's second album One in a Million was "very much ahead of its time, with the bass and electro kind of R&B sounds that they produced", referring to collaborators Timbaland and Missy Elliott and that the sound, which "really stood out" at its time, was being replicated. With sales of 8.1 million albums in the United States and an estimated 24 to 32 million albums worldwide, Aaliyah earned the nicknames "Princess of R&B" and "Queen of Urban Pop", as she "proved she was a muse in her own right". Ernest Hardy of Rolling Stone dubbed her as the "undisputed queen of the midtempo come-on". She has also been referred to as a pop and R&B icon for her impact and contributions to those respective genres.