(known then as the International Terminal). The new International Terminal includes the San Francisco Airport Commission Aviation Museum and Library and the Louis A. Turpen Aviation Museum, as part of the SFO Museum. SFO's long-running museum exhibition program, now called SFO Museum, won unprecedented accreditation by the American Alliance of Museums in 1999. SFO experiences delays (known as flow control) in overcast weather when only two of the airport's four runways can be used at a time because the centerlines of the parallel runway sets (01R/01L and 28R/28L) are only apart. Airport planners advanced proposals that would extend the airport's runways by adding up to of fill to San Francisco Bay and increase their separation by up to in 1998 to accommodate arrivals and departures during periods of low visibility. Other proposals included three floating runways, each approximately long and wide. The airport would be required by law to restore Bay land elsewhere in the Bay Area to offset the fill. One mitigation proposal would have the airport purchase and restore the of South Bay wetlands owned by Cargill Salt to compensate for the new fill. These expansion proposals met resistance from environmental groups, including the Sierra Club, fearing damage to the habitat of animals near the airport, recreational degradation (such as windsurfing) and bay water quality. State Senator John L. Burton introduced SB 1562 on February 18, 2000, to bypass the environmental impact study that would normally be required for a large project like the proposed Bay fill and mitigation in order to expedite construction. SB 1562 was signed into law on September 29, 2000. A study commissioned by the airport and released in 2001 stated that alternatives to airport expansion, such as redirecting traffic to other regional airports (Oakland or San Jose), capping the number of flights, or charging higher landing fees at selected times of the day 2001 would result in higher fares and poorer service. However, the proposal to build new runways on Bay fill continued to attract opposition from environmental groups and local residents. The airport expansion cost was estimated at in 1998, rising to a year later, including an estimate of for the Cargill wetlands purchase and restoration. The delays during poor weather (among other reasons) caused some airlines, especially low-cost carriers such as Southwest Airlines, to shift all of their services from SFO to the Oakland and San Jose airports. However, Southwest eventually