SeaPort Airlines (Seattle Boeing Field) restarted scheduled passenger operations on May 20, 2025, nearly nine years after it went out of business and liquidated. The operator is focusing on a high-frequency shuttle service between Seattle Boeing Field and Portland International with a fleet of PC-12/45s.

According to its internet booking engine, SeaPort Airlines initially plans to use two PC-12 turboprops, each seating up to nine passengers: N524TW (msn 361) and N840AG (msn 296). The former was recently operated under the Part 135 certificate of sister company Air Excursions, and the latter was in private operations.

While the launch schedule includes 8x daily flights, the operator said it intended to increase the frequency over time and schedule departures every 45 minutes. The operator confirmed to ch-aviation that flights will be operated under Air Excursions' Part 135 certificate.

"By flying through our private terminal at Portland International and Seattle’s Boeing Field, just minutes from downtown, our customers will avoid the snarl of both I-5 [interstate motorway] and Seattle Tacoma International airport. This commuter shuttle service will make the travel experience quicker, easier, and more predictable compared to navigating clogged freeways and an over-subscribed global-scale international airport in Seattle," said Kent Craford, chairman and CEO of parent company Kalinin Holdings.

Craford founded SeaPort Airlines (2008) (Portland International) but left in 2009 due to disagreements with the then-investors. In its previous iteration, SeaPort Airlines operated regional flights with a fleet of Cessna (single turboprop) C208 Grand Caravans. It filed for Chapter 7 bankruptcy in 2016 after what it says was "an ill-fated expansion into government subsidy markets", which was pursued after Craford left.

In 2011, Craford, with two other investors, acquired Alaska Seaplanes. Both regional operators are now held through Kalinin Holdings, which also owns Air Excursions and Island Air Express (I4, Craig). FAA records show the investment firm owns a fleet of 23 aircraft, including ten Cessna C208s, five PC-12/45s, two PC-12/47s, one Piper PA-18, two Cessna U206s, and three DHC-2s.

Kalinin Aviation, trading as Alaska Seaplanes, operates four DHC-2s, two U206s, and seven C208s under its Part 135 certificate.