About YYZlaw

YYZlaw is a small Toronto corporate and regulatory law practice built entirely around the aviation and travel industries. Bill Clark founded the firm as Clark & Company in 1999; it later took the name YYZlaw. The practice acts for business aircraft owners and operators, aircraft lessors and lessees, scheduled and charter airlines flying into Canada, domestic air carriers, and Canadian aerospace companies, and it's often brought in by other law firms for aviation specific transactional or regulatory matters.

The firm's roots go back further than 1999. Before starting Clark & Company, Bill Clark practiced at Nobbs, Woods & Clark, continuing an aviation law practice with origins in the mid-1950s, and was called to the Ontario Bar in 1971. Clark went on to spend more than a decade on the Canadian Business Aviation Association's board, received the association's Honorary Lifetime Membership award in 2015, and has served as designated legal counsel for the Canadian Association of Tour Operators since it was founded. The wider team brings its own aviation credentials to the file work, including a commercial pilot's license, an LL.M. in Air & Space Law from McGill University, and, on the sports side, a place on Canada's national fencing team at the Tokyo 2020 Olympic Games.

Milestones & recognition

  • Bill Clark founded the firm as Clark & Company in 1999; it's now known as YYZlaw.
  • Before founding the firm, Clark practiced at Nobbs, Woods & Clark, continuing an aviation law practice that traces back to the mid-1950s.
  • Clark was called to the Ontario Bar in 1971.
  • Clark served on the Canadian Business Aviation Association's board for more than a decade and received the CBAA's Honorary Lifetime Membership award in 2015.
  • Clark has been the designated legal counsel for the Canadian Association of Tour Operators since its inception.

In the community

  • The firm's contracts administrator holds a Law Clerk certificate from the Institute of Law Clerks of Ontario and takes part in industry organizations including Women in Aviation, Women in Aerospace, and the International Aviation Women's Association.
  • The firm's legal assistant organizes community sporting leagues outside of work.
  • One of the firm's associates writes an aviation blog, 100 Knots, that has built a following of more than 30,000 readers on LinkedIn, and that associate's writing on aircraft leasing and financing has been published by Bloomsbury.

Good to know

A person using a wheelchairWheelchair accessibleA calendar with a checkmark beside a clockBy appointment

This firm’s lawyers at a glance

Law schools
University of British Columbia 1 of 3 lawyers

The neighbourhood

YYZlaw's office is at 100 Richmond Street West, Suite 330, in Toronto, the head office for a firm the team describes as eating, breathing and sleeping everything aviation and travel related.

The firm's real anchor, though, is a short drive west: Toronto Pearson International Airport. By the firm's own account, the airport's roster of foreign carriers grew from just two at the start of Bill Clark's career to the second largest in North America, and that growth in scheduled and charter traffic is a large part of why a Toronto address makes sense for a law practice built entirely around aviation.

Frequently asked questions

What kind of legal work does YYZlaw handle?
YYZlaw is a corporate and regulatory law practice focused on the aviation and travel industries. Its work covers aircraft transactions, tax advice, aviation regulatory compliance, mergers and acquisitions, and travel industry licensing.
Can YYZlaw help with buying, selling or leasing a business aircraft?
Yes. The firm negotiates aircraft purchase, sale, lease, management and financing agreements, with representative work spanning turboprops and helicopters up to large business jets like the Bombardier Global 7500 and Gulfstream G-V.
Does YYZlaw work with airlines flying into Canada?
Yes. The firm advises both foreign and domestic air carriers on establishing and operating service to Canada, including aircraft registration, IDERAs, and licensing matters before the Canadian Transportation Agency.
Can YYZlaw help a travel agency or wholesaler get licensed in Ontario?
Yes. The firm handles travel industry licensing, including provincial requirements and registration with the Travel Industry Council of Ontario for travel agencies and wholesalers.
How long has YYZlaw been practicing aviation law?
The firm was founded as Clark & Company in 1999. Its founder's earlier practice, at Nobbs, Woods & Clark, traces the firm's roots back to aviation law work that began in the mid-1950s.
Where is YYZlaw located and how do I reach the firm?
YYZlaw's head office is at 100 Richmond Street West, Suite 330, in Toronto. The firm can be reached by phone or through the contact form on its website.

Where to find them

100 Richmond Street West, Suite 330, Toronto, Ontario M5H 3K6 · 416-681-9300

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Listing compiled from the firm’s public website in September 2026. Verify licence status in the Law Society of Ontario directory ↗