Embraer Commercial Aviation president and CEO John Slattery sees strong momentum for both the E1 and E2 aircraft families now that the company signed commitments for up to 300 additional aircraft at the Farnborough Airshow.

The largest commitment is a firm order for 100 E175-E1s plus 100 additional purchase rights placed by U.S. regional carrier Republic Airways. Along with the 25 aircraft ordered by United Airlines for its regional operation, the deal ensures Embraer has a significant backlog of E1s as E2 production is ramped up. All of the United aircraft are to be delivered in 2019, according to Embraer chief commercial officer Arjen Meijer. Republic has conversion rights from the E1 to the E2 version of the E175 should scope clause agreements at major U.S. airlines it operates for be relaxed.

Several airlines also placed significant orders for the E2. Brazil’s Azul added 21 aircraft to its firm order for 30 E195-E2s. The order is currently still a letter of intent. Azul operates 63 E-jets, some of which will be replaced by the E2s over the next five years, the carrier said.

Swiss regional carrier Helvetic, currently operating a fleet of E190s, signed a letter of intent for up to 24 E190-E2s, twelve of which are to be converted into a firm order. The refleeting of the airline is to take place over the next two years, enabling Embraer to continue the planned production increase for the E190-E2.

Wataniya, which currently only operates the Airbus A320 family, is expanding to include the E-195-E2. The airline signed a firm order for ten aircraft, plus ten options. Wataniya will also be the launch customer for the staggered business-class seat Embraer has been promoting as part of the E2 cabin design.

Up to five additional E195-E2s will be delivered to an undisclosed Spanish airline; three aircraft are on firm order. Also, Mauritania Airways bought two E175s and lessor NAC signed up for three additional E190s.