Cheongju International Airport CJJ / RKTU

Ramp and passenger ground handling for Korean Air, Jin Air and other carriers at CJJ; confirmed via Korea Airports Corporation's own Cheongju airport facility phone directory (listed as "한국공항(주)" under the airline/ground-service section, •••), and per company profile this Hanjin-group handler runs a Cheongju business office (청주사업소) alongside Incheon, Gimpo, Busan, Jeju, Daegu and Yangyang.

Dedicated ground-handling joint venture (Swissport 51% / Aero K Holdings 49%, capital KRW 3bn) formed to handle Aero K flights at Cheongju International Airport from 1 April 2021; Swissport's own network listings include Cheongju (CJJ), and trade press (AJOT, CargoNews) reported the JV's office on the 1st floor of the CJJ terminal.

Independent (non-airline-affiliated) ground handler; confirmed via Korea Airports Corporation's own Cheongju airport facility phone directory (listed as "(주)샤프 에이비에이션 케이", •••), and company history states it expanded ramp/ground operations to Cheongju by 1995.

Into-plane fuelling operations at CJJ; company literature states it performs fuelling ("급유조업") at Incheon, Gimpo, Busan, Jeju, Daegu, Yangyang and Cheongju.

Into-plane aviation-fuel supply and sales; confirmed via Korea Airports Corporation's own Cheongju airport facility phone directory (listed as "한유엘앤에스", •••), consistent with company statements that it opened its Cheongju branch in January 2001 and supplies fuel to all aircraft operating at Cheongju International Airport via hydrant fuelling facilities and refuelers, with IATA-standard in-house lab quality control.

De/anti-icing is standard winter ramp practice at this cold-climate Korean airport (CJJ sees regular winter snow/ice) and would fall to the on-field ground handler; not separately itemised as a CJJ-specific service by this company, so marked seasonal pending direct confirmation.

Aircraft maintenance (항공정비) listed among the Cheongju business office's services for Korean Air/Jin Air; understood as line/transit-level support rather than hangar-based checks, which are unconfirmed at CJJ.

T'way Airlines' handling subsidiary (est. Oct 2017) is reported by Korea Aviation News trade coverage to manage duty-free stock, in-flight meal (기내식) loading, in-flight supplies setting and warehouse management across the carrier's network including Cheongju; T'way Airlines itself is confirmed operating at CJJ (KAC facility directory, •••), but this subsidiary has no separate CJJ listing, so its presence there is marked unconfirmed pending direct evidence.

Building/facility-management and cleaning-services firm with job postings specifically advertising "청주공항 기내청소" (Cheongju airport cabin cleaning) roles, based in Naesu-eup near CJJ; not listed in Korea Airports Corporation's own Cheongju facility phone directory, so marked unconfirmed pending a source independent of job-posting evidence.

GSE service line (towing tractors, loaders, support vehicles) is part of the company's standard ground-services offering per its own service page; this is a group-level capability claim, not separately itemised for CJJ, so marked unconfirmed pending CJJ-specific evidence.

Air cargo handling (항공화물) listed as part of the Cheongju business office's own service line-up for Korean Air/Jin Air; specific tonnage/terminal detail unconfirmed.

Aviation security screening (passenger/baggage X-ray, ETD, identity verification, restricted-area access control) reportedly provided at CJJ per the company's own branch listing and Cheongju-branch recruitment postings (branch address 충북 청주시 청원구 내수읍 오창대로 980, matching the airport's own locality); however this entity does not appear in Korea Airports Corporation's own published Cheongju facility phone directory, which instead lists KAC's in-house "Service Security Division" (1661-2626), so marked unconfirmed pending a source independent of the company's own postings.