By JACK GILLUM and STEPHEN BRAUN, Associated Press

WASHINGTON (AP) — Illinois Rep. Aaron Schock, a rising Republican star already facing an ethics inquiry, has spent taxpayer and campaign funds on flights aboard private planes owned by some of his key donors, The Associated Press has found. There also have been other expensive travel and entertainment charges, including for a massage company and music concerts.

The expenses highlight the relationships that lawmakers sometimes have with donors who fund their political ambitions, an unwelcome message for a congressman billed as a fresh face of the GOP. The AP identified at least one dozen flights worth more than $40,000 on donors' planes since mid-2011.

The AP tracked Schock's reliance on the aircraft partly through the congressman's penchant for uploading pictures and videos of himself to his Instagram account. The AP extracted location data associated with each image then correlated it with flight records showing airport stopovers and expenses later billed for air travel against Schock's office and campaign records.

Asked for comment, Schock responded in an email on Monday that he travels frequently throughout his Peoria-area district "to stay connected with my constituents" and also travels to raise money for his campaign committee and congressional colleagues.

He said he takes compliance with congressional funding rules seriously and has begun a review of his office's procedures "concerning this issue and others to determine whether they can be improved." The AP had been seeking comment from Schock's office since mid-February to explain some of his expenses.

Donors who owned planes on which travel was paid for by Schock's House and political accounts did not immediately respond to requests seeking comment Monday.

Schock's high-flying lifestyle, combined with questions about expenses decorating his office after the TV show "Downton Abbey," add to awkward perceptions on top of allegations he illegally solicited donations in 2012.

The Office of Congressional Ethics said in a 2013 report that there was reason to believe Schock violated House rules by soliciting campaign contributions for a committee that backed Rep. Adam Kinzinger, R-Ill., in a 2012 primary. The House Ethics Committee has said that query remains open.

"Haters are gonna hate," Schock, 33, told ABC News after the "Downton Abbey" story broke in The Washington Post, brushing off the controversy by invoking a line from one of pop singer Taylor Swift's songs.

Lawmakers can use office funds for private flights as long as payments cover their share of the costs. But most of the flights Schock covered with office funds occurred before the House changed its rules in January 2013. The earlier rules prohibited lawmakers from using those accounts to pay for flights on private aircraft, allowing payments only for federally licensed charter and commercial flights.

Schock's House account paid more than $24,000 directly to a Peoria aviation firm for eight flights provided by one of Schock's donor's planes in 2011 and 2012. While the aircraft flies as part of an Illinois charter service, the owner of the service told the AP on Monday that any payments made directly to the donor's aviation company would not have been for charter flights.

Beyond air travel, Schock spent thousands more on tickets for concerts, car mileage reimbursements — among the highest in Congress — and took his interns to a sold-out Katy Perry concert in Washington last June.

The donor planes include an Italian-made Piaggio twin-engine turboprop owned by Todd Green of Springfield, Illinois, who runs car dealerships in Schock's district with his brother, Jeff. Todd Green told a Springfield newspaper that Jeff — a pilot and campaign contributor — and Schock have been friends for a long time.

The AP found that Green's plane traveled to at least eight cities last October in the Midwest and East Coast, cities where Schock met with political candidates ahead of the midterm elections. His Instagram account's location data and information from the service FlightAware even pinpointed Schock's location on a stretch of road near one airport before Green's plane departed.

Campaign records show a $12,560 expense later that month to Jeff Green from a political action committee associated with Schock, called the "GOP Generation Y Fund." That same month, the PAC paid $1,440 to a massage parlor for a fundraising event.

In November 2013, Schock cast votes in the Capitol just after Green's plane landed at nearby Reagan National Airport. Shortly after Green's return to Peoria, Schock posted a photo from his "Schocktoberfest" fundraising event at a brewery in his district. Schock billed his office account $11,433 for commercial transportation during that same, four-day period to a Peoria flight company, Byerly Aviation.

The AP's review covered Schock's travel and entertainment expenses in his taxpayer-funded House account, in his campaign committee and the GOP Generation Y Fund. Records show more than $1.5 million in contributions to the Generation Y Fund since he took office in 2009.

Schock used House office expenses to pay more than $24,000 for eight flights between May 2011 and December 2012 on a six-passenger Cessna Golden Eagle owned by D&B Jet Inc., run by Peoria agribusiness consultant and major Schock donor Darren Frye. While D&B is a private corporate aviation firm, it also flies with Jet Air Inc., an Illinois-based aviation firm licensed by the FAA for charter service.

Records show Schock used House funds to directly pay D&B instead of Jet Air for the eight flights. Under the old rules that previously allowed House funds to pay only for charter or commercial aircraft, Schock's office would likely not have been authorized to pay for private flights unless the House Ethics Committee approved it.

Harrel W. Timmons, Jet Air's owner, said in a telephone interview that any charter flights D&B flies through his firm are paid directly to Jet Air. "They've got their own corporate jet and pilot," he said.

House records also show that, since 2013, Schock has flown four times on a Cessna owned by Peoria auto dealer Michael J. Miller and businessman Matthew Vonachen, who heads a janitorial firm, Vonachen Services Inc. Schock's House office account paid nearly $6,000 total for the four flights, according to federal data published online by the nonprofit Sunlight Foundation.

Under current House rules, the payments for the private flights would be authorized if they paid for Schock's portion of each flight. It is not clear from records how many other passengers flew on the same flights. USA Today on Friday first reported potential issues with House ethics rules in revealing some of the flights.

Vonachen and his family donated at least $27,000 to Schock's campaigns, while Miller contributed $10,000 to the Automotive Free International Trade PAC. Schock has supported recent free trade agreements with South Korea and with several other countries, which the Automotive PAC — a Schock contributor — lauded.

Schock's reliance on donor-owned planes and on his government allowance to pay for the flights mirrors the use by Sen. Robert Menendez, D-N.J., of a private jet owned by a wealthy eye doctor and major donor. Prompted by an ethics investigation, Menendez reimbursed donor Salomon Melgen $58,500 for two flights.

GOP Generation Y paid more than $24,000 for tickets and festivals, including $13,000 to country music events, $4,700 in expenses to Chicago ticket broker SitClose.com, and $3,000 for a "fundraising event" to an organization that runs the Global Citizen Festival in New York.

"You can't say no when your boss invites you. Danced my butt off," one former intern posted on his Instagram account with a picture of Perry at her June 2014 show. PAC records show a $1,928 expense for the ticket service StubHub.com two months later, listing it only as a "PAC fundraising event."

Records show Schock also requested more than $18,000 in mileage reimbursements since 2013, among the highest in Congress. His office has previously said it was reviewing those expenses.

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Associated Press writers Kerry Lester in Peoria, Illinois, and Matthew Daly in Washington contributed to this report.

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Follow Jack Gillum on Twitter: https://twitter.com/jackgillum